>1v53B (B:) observed residues (from ATOM records)
mkmklavlpgdgigpevmdaairvlktvldndgheavfenaliggaaideagtplpeetl
dicrrsdaillgavggpkwdhnpaslrpekgllglrkemglfanlrpvkayatllnaspl
krervenvdlvivreltgglyfgrpserrgpgenevvdtlaytreeieriiekafqlaqi
rrkklasvdkanvlessrmwreiaeetakkypdvelshmlvdstsmqlianpgqfdvivt
enmfgdilsdeasvitgslgmlpsaslrsdrfgmyepvhgsapdiagqgkanplgtvlsa
almlrysfglekeaaaiekavddvlqdgyctgdlqvangkvvstieltdrliekln