>1w73A (A:) observed residues (from ATOM records)
ntealqskffsplqkamlppnsfqgkvafitgggtglgkgmttllsslgaqcviasrkmd
vlkataeqissqtgnkvhaiqcdvrdpdmvqntvselikvaghpnivinnaagnfispte
rlspnawktitdivlngtafvtleigkqlikaqkgaaflsittiyaetgsgfvvpsasak
agveamskslaaewgkygmrfnviqpgpiktldptgtfekemigripcgrlgtveelanl
aaflcsdyaswingavikfdggeevlisgefndlrkvtkeqwdtieel