>2b2xM (M:) observed residues (from ATOM records)
qiqltqspsslsasvgdrvtitcsassqvnhmfwyqqkpgkapkpwiyltsylasgvpsr
fsgsgsgtdytltisslqpedfatyycqqwsgnpwtfgqgtkveikradaaptvsifpps
seqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstltl
tkdeyerhnsytceathktstspivksfnr