>2xx3A (A:) observed residues (from ATOM records)
arrgalivlegvdragkstqsrklvealcahraellrfpersteigkllsvedhsvhllf
sanrweqvplikeklsqgvtlvvdryafsgvaftgakenfsldwckqpdvglpkpdlvlf
lqlqladaakrgafgheryengafqeralrcfhqlmkdttlnwkmvdasksieavhedir
vlsedairtatekplgelwk