>4pn3B (B:) observed residues (from ATOM records)
hhhhhmqienrvflitgagsglgaavskmaveagakvvlldvnaeageagakalgasarf
qrtdvasdtdgkaaiaaaieafsridvlvncagvapgekvlgregahkletftrtisinl
igtfnmlrlaaeamaknepgqggergviintasvaafdgqigqaaysaskggvaamtlpv
arelarhgirvmtiapgifktpmmagmpqevqdalgasvpfpprlgepaeyaalvrhive
nqmlngevirldgalrmaak