>3sx7A (A:) observed residues (from ATOM records)
fmvslprmvypqpkvltpcrkdvlvvtpwlapivwegtfnidilneqfrlqnttigltvf
aikkyvaflklfletaekhfmvghrvhyyvftdqpaavprvtlgtgrqlsvlevraykrw
qdvsmrrmemiscerrflsevdylvcvdvdmefrdhvgveiltplfgtlhpsfygssrea
ftyerrpqsqayipkdegdfyymggffggsvqevqrltrachqammvdqangieavwhde
shlnkyllrhkptkvlspeylwdqqllgwpavlrklrftavpknh