>1pn4B (B:) observed residues (from ATOM records)
pvwrfddrdvilynialgattkqlkyvyendsdfqviptfghlitfnsgksqnsfakllr
nfnpmlllhgehylkvhswppptegeikttfepiattpkgtnvvivhgsksvdnksgeli
ysneatyfirncqadnkvyadrpafatnqflapkrapdyqvdvpvsedlaalyrlsgdrn
plqidpnfakgakfpkpilhgmctyglsakalidkfgmfneikarftgivfpgetlrvla
wkesddtivfqthvvdrgtiainnaaiklvgd