>1a50A (A:) observed residues (from ATOM records)
eryenlfaqlndrregafvpfvtlgdpgieqslkiidtlidagadalelgvpfsdpladg
ptiqnanlrafaagvtpaqcfemlalirekhptipigllmyanlvfnngidafyarceqv
gvdsvlvadvpveesapfrqaalrhniapificppnadddllrqvasygrgytyllsrsg
vtgaenhhlieklkeyhaapalqgfgisspeqvsaavragaagaisgsaivkiieknlas
pkqmlaelrsfvsamkaasr