>2ch2A (A:) observed residues (from ATOM records)
ftpppaslrnpliipekimmgpgpsncskrvltamtntvlsnfhaelfrtmdevkdglry
ifqtenratmcvsgsahagmeamlsnlleegdrvliavngiwaeravemserygadvrti
egppdrpfsletlaraielhqpkclflthgdsssgllqplegvgqichqhdcllivdava
slcgvpfymdkweidavytgaqkvlgappgitpisispkaldvirnrrtkskvfywdlll
lgnywgcydepkryhhtvasnlifalrealaqiaeeglenqikrriecaqilyeglgkmg
ldifvkdprhrlptvtgimipkgvdwwkvsqyamnnfslevqgglgptfgkawrvgimge
cstvqkiqfylygfkeslkathpdyif