4PDB|1|I|A|14	s3O4'	4PDB|1|I|U|15	
4PDB|1|I|U|15	sO4'3	4PDB|1|I|A|14	
4PDB|1|I|C|20	sO4'3	4PDB|1|I|G|21	
4PDB|1|I|G|21	s3O4'	4PDB|1|I|C|20