Loop 1 Internal loop

Column numbers: 29-48, 69-73 - View nucleotides in PDB file(s)
    Scored sequences and counts
G-UGA--------AGAU--G*C-UGC 35
G-UGA--------AGA---A*U--GC 21
G-UGA--------AGA---G*U--GC 16
G-UGU--------AGAU--A*U-UGC 14
G-UGA--------AGAU--A*U-UGC 10
G-UGU--------AUG---C*G-GUC 8
G-UGC--------AGA---G*U--GC 8
G-UGA--------AGA---G*U-UGC 7
A-UGA--------ACAA--A*U---U 7
C-UGA--------AGA---G*U--GG 7
G-UGA--------AUAA--A*U---C 7
G-UGUGAGAAAUCGAA---A*U---C 5
G-UGA--------AGAU--C*G-UGC 4
G-UGA--------AGA---C*G--GC 4
G-UGC--------AGA---G*C--GC 4
G-UGG--------AGA---G*U--GC 4
G-UGA--------AAA---C*G---C 4
G-UGC--------ACUAAAG*C-CUC 3
G-UGA--------AGAA--G*C-UGC 3
A-UGA--------AAAA--C*G--G- 3
G-UGA--------AGU---C*G--GC 3
G-UGC--------AGA---A*U--GC 3
G-UGC--------AGA---U*A--GC 3
A-UGU--------AUA---A*U---U 3
G-UGU--------AU----U*G--UC 3
G-UGUGCGAAAGCGAA---A*U---C 2
G-UGA--------AGAU--G*U-UGC 2
G-UGC--------AGAU--A*U-UGC 2
G-UGC--------AGAU--G*C-UGC 2
G-UGC--------AGAU--U*A-UGC 2
G-UGU--------AGAU--G*C-UGC 2
G-UGU--------AGAU--U*A-UGC 2
G-UGA--------AGA---A*U-UGC 2
G-UGA--------AGA---G*C-UGC 2
UCUGU--------AA----G*U-AGA 2
G-UGA--------ACAA--A*U---C 2
G-UGC--------AGA---C*G--GC 2
G-UGC--------AUAA--C*G---C 2
G-UGU--------AGA---A*U--GC 2
G-UUA--------UAAA--A*U---C 2
C-UGU--------AA----G*U--AG 2
G-UGA--------AUG---U*G---C 2
G-UGC--------AUA---A*U---C 2
G-UGU--------AG----A*U--GC 2
G-UGU--------AGA---U*G---C 2
G-UGU--------AUA---A*U---C 2
U-UGG--------AAA---C*G---G 2
A-UGA--------AA----A*U---U 2
G-UGG--------AU----G*C---C 2
G-UAA--------CC-----*---GC 2
G-UGC--------ACUAAAG*CCCUC 1
G-UGC--------ACUAAAG*C-AUC 1
G-UGC--------AGAGG-G*C-UGC 1
G-UGU--------AGAU--G*CCUGC 1
U-UGG--------AAACA-C*G-UGG 1
G-UGA--------AUAAA-G*C--UC 1
G-UGC--------AGAG--G*C-UGC 1
G-UGC--------AGAU--C*G-UGC 1
G-UGC--------AGAU--G*U-UGC 1
G-UGC--------AUGA--A*U-UGC 1
G-UGG--------AUAA--G*C-GCC 1
G-UGU--------AGAU--C*G-UGC 1
G-UGU--------AUAAA-U*A--UC 1
G-UUA--------AGAU--C*G-UGC 1
A-UGU--------AUGA--A*U--GU 1
G-UGA--------AGAA--G*U--GC 1
G-UGC--------AGA---G*U-UGC 1
G-UGC--------AGAA--U*A--GC 1
G-UGC--------AUAA--A*U--UC 1
G-UGC--------CAAA--G*U--UC 1
G-UGU--------AUA---A*U-GGC 1
G-UUA--------UUAAA-A*U---C 1
UCUGU--------AA----G*U-AGG 1
A-UGA--------AAGA--C*G---U 1
A-UGA--------ACAA--U*A---U 1
A-UGA--------CAGA--C*G---U 1
A-UGC--------ACA---A*U--UU 1
G-UCA--------UAAA--A*U---C 1
G-UCA--------UAAA--U*A---C 1
G-UGA--------AGA---U*A--GC 1
G-UGA--------AUA---G*C--AC 1
G-UGC--------ACUA--A*U---C 1
G-UGC--------UAAA--C*G---C 1
G-UGU--------AGA---G*U--GC 1
G-UGU--------AUG---A*U--GC 1
G-UUA--------AAAA--G*U---C 1
G-UUA--------GAAA--A*U---C 1
G-UUG--------AAG---C*G--UC 1
U-UGA--------UAAA--C*G---G 1
A-UGC--------ACA---A*U---U 1
G-UGA--------AAA---A*U---C 1
G-UGA--------AGA---U*G---C 1
G-UGC--------ACA---A*U---C 1
G-UGC--------AGA---C*G---C 1
G-UGC--------AGA---U*G---C 1
G-UGU--------AAA---C*G---C 1
U-UGG--------AAAC---*---GG 1
U-UUG--------UAA---U*A---A 1
A-UAA--------UU----C*G---U 1
G-UGA--------AG----U*G---C 1
G-UGG--------AG----U*G---C 1
Click on headings to reorder table
# Matching motif group Acceptance Rate Mean Cutoff Score Full Edit Distance Interior Edit Distance Basepair Diagram and most common annotation
1 8.62 -73.59 6 4

2 7.24 -73.00 6 5

3 3.45 -106.02 7 6

Minor groove platform

4 3.45 -496.29 5 3

5 3.10 -60.51 8 5

6 3.10 -104.09 6 5

7 1.72 -120.35 8 5

8 1.38 -119.28 6 5

9 1.38 -179.93 7 5

SSU/LSU pseudoknot

10 1.03 -176.43 5 4

11 1.03 -230.10 9 6

12 0.69 -90.35 9 5

13 0.69 -103.55 8 5

14 0.69 -107.80 9 6

15 0.69 -163.07 7 5

16 0.69 -261.77 7 3

17 0.69 -329.22 8 5

18 0.34 -76.53 9 6

19 0.34 -77.26 8 5

20 0.34 -89.06 8 5

cWH basepair with bulged bases

21 0.34 -92.06 8 6

22 0.34 -203.41 7 5

Kink-turn related

23 0.00 -64.84 8 6

24 0.00 -65.57 8 6

25 0.00 -71.09 8 6

26 0.00 -85.62 8 5

Vitamin B12 Aptamer

27 0.00 -95.13 8 5

28 0.00 -95.16 6 4

29 0.00 -95.38 10 7

30 0.00 -96.20 7 6

31 0.00 -96.90 8 5

32 0.00 -107.44 10 8

Reverse kink-turn related

33 0.00 -108.22 9 7

34 0.00 -109.84 9 6

35 0.00 -110.32 10 8

36 0.00 -113.08 9 7

37 0.00 -113.48 9 7

38 0.00 -113.58 9 7

39 0.00 -118.23 10 7

40 0.00 -119.51 7 6

41 0.00 -120.90 7 5

42 0.00 -121.49 10 7

43 0.00 -126.59 9 7

44 0.00 -127.22 8 6

45 0.00 -127.73 9 9

46 0.00 -128.48 8 6

47 0.00 -131.13 8 5

48 0.00 -131.83 8 5

49 0.00 -135.18 10 7

50 0.00 -136.45 11 8

51 0.00 -140.23 6 5

52 0.00 -141.43 9 5

53 0.00 -141.65 10 7

Reverse turn

54 0.00 -150.45 10 8

55 0.00 -153.32 7 5

56 0.00 -153.91 9.5 7

57 0.00 -156.67 10 8

58 0.00 -157.54 9 7

59 0.00 -158.23 6 5

UAA/GAN related

60 0.00 -160.38 10 8

61 0.00 -164.84 9 6

62 0.00 -169.83 10 9

63 0.00 -169.86 12 10

64 0.00 -171.42 6 4

65 0.00 -171.52 9 7

66 0.00 -171.94 13 10

Kink-turn related

67 0.00 -173.97 10 8

Pseudoknot

68 0.00 -176.79 8 5

Intercalated tWH

69 0.00 -176.89 10 8

70 0.00 -178.65 11 9

71 0.00 -181.97 9 6

Pseudoknot

72 0.00 -183.16 9 7

73 0.00 -183.92 12 10

74 0.00 -185.29 9 6

Major groove intercalation

75 0.00 -189.37 10 8

76 0.00 -191.19 12 9

77 0.00 -193.06 8 5

78 0.00 -194.97 11 9

79 0.00 -195.26 7 5

80 0.00 -198.35 7 5

81 0.00 -198.37 14 12

82 0.00 -200.09 8 6

83 0.00 -200.59 9 8

84 0.00 -204.36 10 9

85 0.00 -207.30 9 7

86 0.00 -211.50 11 9

87 0.00 -212.22 15 12

88 0.00 -214.93 7 5

89 0.00 -215.23 9 6

90 0.00 -216.97 11 9

91 0.00 -217.90 14 11

Pseudoknot

92 0.00 -220.92 15 12

Kink-turn

93 0.00 -222.40 7 6

94 0.00 -227.96 10 8

95 0.00 -229.48 8 5

96 0.00 -230.24 11 8

97 0.00 -237.55 13 11

98 0.00 -247.98 12.5 11

Pseudoknot

99 0.00 -250.06 10 9

100 0.00 -252.28 10 9

101 0.00 -257.30 10 6

Reverse kink-turn related

102 0.00 -262.10 10 7

103 0.00 -262.17 8 5

Kink-turn

104 0.00 -263.79 9 6

105 0.00 -264.72 9 5

tSH-tHW

106 0.00 -264.88 15.5 13

107 0.00 -265.58 13 12

108 0.00 -267.00 6 6

109 0.00 -267.84 10 7

110 0.00 -268.00 8 5

111 0.00 -269.98 7 5

tSH-tHS-tHW

112 0.00 -271.68 8 7

113 0.00 -272.15 6 5

Kink-turn

114 0.00 -282.45 7 6

115 0.00 -286.19 7 6

116 0.00 -286.95 16 14

117 0.00 -287.94 6 5

118 0.00 -290.20 8 4

119 0.00 -290.31 10 7

120 0.00 -291.14 9 6

121 0.00 -291.63 8 5

Kink-turn related

122 0.00 -291.72 8 5

123 0.00 -296.39 7 5

124 0.00 -299.50 10 8

125 0.00 -301.65 8 7

126 0.00 -302.01 9 6

Reverse kink-turn

127 0.00 -302.62 8 5

128 0.00 -304.64 8 6

129 0.00 -304.96 6 5

130 0.00 -305.60 8 6

tHW-tHW cross-strand stack

131 0.00 -307.21 10 6

132 0.00 -309.93 6 4

133 0.00 -311.61 14 13

134 0.00 -315.97 9 5

135 0.00 -317.66 10 8

136 0.00 -319.37 12 10

9x9 Sarcin-Ricin with pseudoknotted region; G-bulge

137 0.00 -319.38 10 8

138 0.00 -321.01 17 15

139 0.00 -323.23 10 7

140 0.00 -323.36 16 14

141 0.00 -327.46 15 14

142 0.00 -332.20 11 7

8x6 Sarcin-Ricin with inserted A; G-bulge

143 0.00 -333.02 8 6

144 0.00 -334.04 8 6

Kink-turn

145 0.00 -338.43 8 6

146 0.00 -338.81 15 12

147 0.00 -339.22 9 7

Sarcin-Ricin target in LSU H95; G-bulge

148 0.00 -343.56 10 7

Kink-turn

149 0.00 -343.60 9 7

150 0.00 -343.84 10 8

Kink-turn related

151 0.00 -343.87 8 5

180 degree turn

152 0.00 -348.45 7 4

Kink-turn

153 0.00 -349.63 8 5

Kink-turn from U4

154 0.00 -349.71 9 6

155 0.00 -352.08 9 8

156 0.00 -356.86 8 6

UAA/GAN with extra stack

157 0.00 -358.02 8 7

Part of G-quadruplex

158 0.00 -358.98 9 8

159 0.00 -359.25 18 16

160 0.00 -359.36 10 6

Kink-turn

161 0.00 -361.22 11 8

162 0.00 -365.22 9 6

163 0.00 -365.89 19 17

164 0.00 -367.69 6 5

165 0.00 -369.57 9 7

166 0.00 -369.94 10 9

167 0.00 -372.31 10 7

168 0.00 -374.91 7 5

Major groove intercalation

169 0.00 -375.51 8 6

170 0.00 -380.98 17 16

171 0.00 -382.87 14 12

172 0.00 -383.35 11 9

173 0.00 -383.67 9 7

Kink-turn with embedded cWW pair

174 0.00 -385.24 8 6

175 0.00 -387.45 11 9

176 0.00 -388.67 7 5

177 0.00 -389.16 11 9

7x11 Sarcin-Ricin with pseudoknotted region; G-bulge

178 0.00 -389.53 8 4

tSH-tHW

179 0.00 -390.15 10 9

180 0.00 -391.60 8 5

Kink-turn related

181 0.00 -392.75 12 9

10x8 Sarcin-Ricin; G-bulge

182 0.00 -395.58 9 7

183 0.00 -396.28 10 8

184 0.00 -396.44 8 5

185 0.00 -397.17 11 7

186 0.00 -402.02 12 8

187 0.00 -402.56 8 5

188 0.00 -403.26 6 5

189 0.00 -403.39 10 8

tSH-tHW-tHH-tHS

190 0.00 -404.05 9 7

191 0.00 -407.07 6 5

192 0.00 -407.20 7 6

Other IL

193 0.00 -407.26 7 5

Isolated non-canonical cWW pair

194 0.00 -409.92 7 6

195 0.00 -410.13 8 7

8x6 Sarcin-Ricin with bulged A; G-bulge

196 0.00 -411.00 8 7

8x6 Sarcin-Ricin with inserted Y; G-bulge

197 0.00 -413.70 10 7

198 0.00 -418.00 9 8

Minor groove platform related

199 0.00 -418.40 9 6

Triple sheared related

200 0.00 -422.08 11 9

201 0.00 -424.35 7 6

202 0.00 -425.50 9 6

6x5 Sarcin-Ricin; G-bulge

203 0.00 -428.42 8 6

Decoding loop related

204 0.00 -429.04 7 6

205 0.00 -434.41 10 8

206 0.00 -434.76 10 7

207 0.00 -435.89 6 5

208 0.00 -436.51 8 5

209 0.00 -437.44 8 7

210 0.00 -438.43 7 6

211 0.00 -439.10 8 5

212 0.00 -439.79 7 5

213 0.00 -441.06 10 9

214 0.00 -448.32 7 5

215 0.00 -449.16 6 5

216 0.00 -451.43 10 7

7x7 Sarcin-Ricin with intercalated A; G-bulge

217 0.00 -454.06 10 9

9x8 Sarcin-Ricin with GA cWW pair; G-bulge

218 0.00 -456.72 8 7

Double sheared; A in syn; two near cWW pairs

219 0.00 -457.11 21 19

220 0.00 -457.20 8 6

221 0.00 -461.44 7 7

Triple sheared with non-canonical cWW

222 0.00 -466.13 8 6

AAA cross-strand stack

223 0.00 -466.19 21 20

224 0.00 -471.12 14 12

225 0.00 -475.77 8 5

226 0.00 -485.05 7 6

227 0.00 -485.21 8 7

228 0.00 -496.11 8 7

8x7 Sarcin-Ricin; G-bulge

229 0.00 -496.30 13 11

230 0.00 -507.97 7 4

Multiple bulged bases

231 0.00 -510.88 12 10

232 0.00 -512.69 6 4

233 0.00 -523.70 10 10

234 0.00 -532.11 7 5

Major groove minor groove platform with intercalation; mini C-loop

235 0.00 -539.02 8 5

236 0.00 -543.29 7 6

UAA/GAN with extra cWW

237 0.00 -551.06 7 5

238 0.00 -552.99 7 5

239 0.00 -564.18 9 7

240 0.00 -566.71 9 7

241 0.00 -571.73 5 4

242 0.00 -576.89 6 5

243 0.00 -582.06 8 6

Bulged stacked bases

244 0.00 -582.57 7 6

245 0.00 -583.02 6 5

Left turn

246 0.00 -596.90 7 5

247 0.00 -597.02 6 5

248 0.00 -603.02 7 5

249 0.00 -605.09 8 6

250 0.00 -606.74 7 5

UAA/GAN

251 0.00 -610.28 6 5

252 0.00 -611.04 6 5

253 0.00 -624.58 7 5

254 0.00 -631.11 15 13

Kink-turn related

255 0.00 -633.44 7 6

256 0.00 -635.35 7 5

257 0.00 -639.66 8 5

258 0.00 -646.62 7 6

259 0.00 -649.26 7 5

260 0.00 -650.06 8 6

UAA/GAN

261 0.00 -651.86 7 5

262 0.00 -658.30 6 5

263 0.00 -667.52 8 6

264 0.00 -668.76 7 5

265 0.00 -671.54 7 5

266 0.00 -675.10 8 6

267 0.00 -677.38 7 5

268 0.00 -679.21 9 6

Multiple bulged bases

269 0.00 -688.33 18 17

270 0.00 -688.42 13 12

271 0.00 -688.50 6 5

Major groove intercalation

272 0.00 -691.95 7 5

Major groove platform with intercalated tWH

273 0.00 -694.20 6 5

274 0.00 -704.63 6 4

275 0.00 -721.50 6 6

276 0.00 -723.68 8 5

277 0.00 -732.67 7 6

278 0.00 -735.86 7 5

Decoding loop related

279 0.00 -743.67 7 5

UAA/GAN related

280 0.00 -750.41 7 6

281 0.00 -752.43 7 7

Minor groove platform

282 0.00 -764.38 6 5

UAA/GAN variation

283 0.00 -771.58 7 5

284 0.00 -797.60 7 5

285 0.00 -808.79 8 7

286 0.00 -811.23 7 6

287 0.00 -814.75 7 6

288 0.00 -851.02 8 6

289 0.00 -871.70 11 9

290 0.00 -908.28 6 5

Major groove minor groove platform; mini C-loop

291 0.00 -917.65 6 5

Minor groove platform

292 0.00 -943.89 7 5

Minor groove platform, major groove intercalation

293 0.00 -956.08 6 5

Major groove platform

294 0.00 -980.42 8 6

295 0.00 -991.47 6 6

Minor groove platform

296 0.00 -992.52 10 7

7x6 Sarcin-Ricin with UU cWW pair; G-bulge

297 0.00 -999.14 9 7

8x7 Sarcin-Ricin; G-bulge

298 0.00 -1054.82 11 9

8x7 Sarcin-Ricin with CC bifurcated pair; G-bulge

299 0.00 -1056.44 9 8

300 0.00 -1060.84 7 5

Intercalated cWS

301 0.00 -1082.01 12 10

302 0.00 -1084.28 6 5

303 0.00 -1086.53 6 5

Isolated non-canonical cWW contact

304 0.00 -1089.16 8 7

7x6 Sarcin-Ricin; G-bulge

305 0.00 -1098.83 7 5

306 0.00 -1133.68 7 5

Major groove platform with intercalation

307 0.00 -1153.35 8 7

308 0.00 -1156.41 8 6

309 0.00 -1163.34 11 8

310 0.00 -1185.67 7 6

Single stack bend

311 0.00 -1199.13 6 5

312 0.00 -1233.46 8.5 7

313 0.00 -1253.09 6 4

314 0.00 -1322.07 7 5

315 0.00 -1337.02 9 6

Kink-turn

316 0.00 -1368.48 8 6

Kink-turn

317 0.00 -1412.83 10 8

tWH-tWH-tHW-tHW

318 0.00 -1444.52 9 7

Kink-turn

319 0.00 -1461.23 7 4

Kink-turn

320 0.00 -1471.75 9 8

321 0.00 -1484.80 7 6

322 0.00 -1488.76 7 6

tSH-tSH-tHH-tHS

323 0.00 -1550.51 6 6

UAA/GAN with tHH

324 0.00 -1559.16 10 7

Kink-turn

325 0.00 -1587.75 9 7

Other IL

326 0.00 -1598.53 8 7

327 0.00 -1629.49 9 6

328 0.00 -1685.23 10 9

Bacterial 5S Loop E

329 0.00 -1692.74 8 7

330 0.00 -1700.81 7 5

331 0.00 -1720.43 8 7

332 0.00 -1773.22 8 6

333 0.00 -1778.70 8 5

Receptor of 11-nt loop-receptor motif

334 0.00 -1799.65 8 7

tSH-tHH-tHS

335 0.00 -1806.03 8 7

tSH-tWH-tHS-cWW

336 0.00 -1824.08 8 6

5x5 Sarcin-Ricin with intercalated A; G-bulge

337 0.00 -1879.92 9 7

tSH-tHW-tWH-tHS

338 0.00 -1924.75 8 5

Receptor of 11-nt loop-receptor motif

339 0.00 -1944.99 7 5

Double sheared

340 0.00 -1958.41 8 5

Kink-turn

341 0.00 -2013.46 7 5

Isolated non-canonical cWW pair

342 0.00 -2022.80 5 4

Isolated non-canonical cWW pair

343 0.00 -2026.98 8 6

cWH basepair and non-canonical AC

344 0.00 -2128.03 8 6

Quadruple sheared

345 0.00 -2146.30 8 6

Tandem non-canonical cWW pairs

346 0.00 -2154.06 7 6

347 0.00 -2165.24 7 6

Isolated non-canonical cWW pair

348 0.00 -2245.46 7 6

Double sheared

349 0.00 -2276.27 10 7

Part of G-quadruplex

350 0.00 -2309.78 9 6

Triple sheared

351 0.00 -2339.66 8 6

Double sheared with non-canonical cWW

352 0.00 -2429.66 7 5

tSH-tHW

353 0.00 -2458.43 10 7

354 0.00 -2515.77 8 6

355 0.00 -2521.92 8 6

Triple non-canonical cWW pairs

356 0.00 -2558.95 8 6

357 0.00 -2612.91 9 7

Other IL

358 0.00 -2667.26 7 6

Tandem non-canonical cWW pairs

359 0.00 -2670.53 8 6

tSH-tWH-tHS

360 0.00 -2689.34 7 5

361 0.00 -2841.60 6 5

Tandem non-canonical cWW pairs

362 0.00 -2842.71 7 5

363 0.00 -2878.24 7 6

Triple sheared

364 0.00 -2962.03 6 5

365 0.00 -2992.15 9 8

Kink-turn related

366 0.00 -3126.82 9 6

367 0.00 -3147.93 6 5

Isolated non-canonical cWW pair

368 0.00 -3196.08 7 6

Isolated cWS basepair

369 0.00 -3216.35 8 6

Isolated tWW turn

370 0.00 -3227.46 7 6

Isolated tHS basepair with bulges

371 0.00 -3232.89 6.5 6

Isolated cWH basepair

372 0.00 -3248.59 9 7

Kink-turn with non-sequential stacking

373 0.00 -3542.60 8 6

374 0.00 -3555.21 8 5

375 0.00 -3558.65 8 6

376 0.00 -3999.50 12 10

377 0.00 -4080.67 12 11

378 0.00 -4298.95 7 6

Major groove platform

379 0.00 -4452.50 7 6

C-loop with bulged stacked A's

380 0.00 -4509.32 8 6

8-nt loop receptor

381 0.00 -4517.58 16 15

382 0.00 -4690.84 12 9

383 0.00 -4811.17 8 5

384 0.00 -4997.90 9 8

385 0.00 -5185.57 10 8

386 0.00 -5390.07 7 5

Minor groove platform

387 0.00 -5398.29 7 4

388 0.00 -5401.09 7 5

Multiple bulged bases

389 0.00 -5421.39 7 6

Stack and bulge

390 0.00 -5517.06 9 7

391 0.00 -5520.33 7 6

Single stack bend

392 0.00 -5526.77 9 6

393 0.00 -5535.34 6 6

Single bulged U

394 0.00 -5544.28 6 6

Single bulged A

395 0.00 -5545.92 7 6

Single bulged G

396 0.00 -5566.67 8 7

Single bulged C

397 0.00 -5701.29 10 8

398 0.00 -6172.00 8 7

399 0.00 -6667.09 7 6

Isolated non-canonical cWW pair

400 0.00 -6758.60 10 8

Symmetric double minor groove platform

401 0.00 -8100.92 10 7

402 0.00 -8594.06 6 5

C-loop

403 0.00 -9999.00 9 6

404 0.00 -9999.00 5 4

405 0.00 -9999.00 6 5

Multiple bulged bases

406 0.00 -9999.00 10 7

407 0.00 -9999.00 7 6

408 0.00 -9999.00 6 5

Major groove platform; stack outside cWW

409 0.00 -9999.00 7 6

Multiple bulged bases

410 0.00 -9999.00 8 6

411 0.00 -9999.00 7 5

C-loop

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