>4i50B (B:) observed residues (from ATOM records)
reivhiqagqcgnqigakfwevisdehgidptgsyhgdsdlqlerinvyyneatgnkyvp
railvdlepgtmdsvrsgpfgqifrpdnfvfgqsgagnnwakghytegaelvdsvldvvr
kesescdclqgfqlthslgggtgsgmgtlliskireeypdrimntfsvmpspkvsdtvve
pynatlsvhqlventdetycidnealydicfrtlklttptygdlnhlvsatmsgvttclr
fpgqlnadlrklavnmvpfprlhffmpgfapltsrltvpeltqqmfdsknmmaacdprhg
ryltvaaifrgrmsmkevdeqmlnvqnknssyfvewipnnvktavcdipprglkmsatfi
gnstaiqelfkriseqftamfrrkaflhwytgegmdemefteaesnmndlvseyqqyqda
ta