>1si2A (A:) observed residues (from ATOM records)
maqpviefmcevldirnideqpkpltdsqrvrftkeikglkvevthcgqmkrkyrvcnvt
rrpashqtfplqvectvaqyfkqkynlqlkyphlpclqvgqeqkhtylplevcnivagqr