>1r74A (A:) observed residues (from ATOM records)
yrtrslgvaaeglpdqyadgeaarvwqlyigdtrsrtaeykawllgllrqhgcqrvldva
cgtgvdsimlveegfsvtsvdasdkmlkyalkerwnrrhepafdkwvieeanwmtldkdv
peggfdaviclgnsfahlpdckgdqsehrlalkniasmvraggllvidhrnydhilstgc
appgkniyyksdltkdvttsvlivnnkahmvtldytvglskfrlsyyphclasftellqa
afggkcqhsvlgdfkpykpgqtyipcyfihvlkrt