>4l50A (A:) observed residues (from ATOM records)
fegcleyetqlrrqfslqhvrvipgladvggrlgigaahmlmsllqpqqmlaigfgeatm
ntlqrlsgfissqqirlvtlsggvgsymtgigqlnaacsvniipaplrassadiartlkn
encvkdvllaaqaadvaivgigavsqqddatiirsgyisqgeqlmigrkgavgdilgyff
dakgdvvtnikihneliglplsalktipvrvgvaggenkaeaiaaamkggyinalvtdqd
taaailrs