>1v53A (A:) observed residues (from ATOM records)
mkmklavlpgdgigpevmdaairvlktvldndgheavfenaliggaaideagtplpeetl
dicrrsdaillgavggpkwdhnpaslrpekgllglrkemglfanlrpvkayatllnaspl
krervenvdlvivreltgglyfgrpserrgpgenevvdtlaytreeieriiekafqlaqi
rrkklasvdkanvlessrmwreiaeetakkypdvelshmlvdstsmqlianpgqfdvivt
enmfgdilsdeasvitgslgmlpsaslrsdrfgmyepvhgsapdiagqgkanplgtvlsa
almlrysfglekeaaaiekavddvlqdgyctgdlqvangkvvstieltdrliekln