>2r3uB (B:) observed residues (from ATOM records)
mtpasynlavrraapavvnvynrlgsgvimdqrgyiitnkhvindadqiivalqdgrvfe
allvgsdsltdlavlkinatgglptipinarrvphigdvvlaignpynlgqtitqgiisa
tgriglnptgrqnflqtdasinhgnsggalvnslgelmgintlsfdkdgetpegigfaip
fqlatkimdklirdg