>1pn4A (A:) observed residues (from ATOM records)
pvwrfddrdvilynialgattkqlkyvyendsdfqviptfghlitfnsgksqnsfakllr
nfnpmlllhgehylkvhswppptegeikttfepiattpkgtnvvivhgsksvdnksgeli
ysneatyfirncqadnkvyadrpafatnqflapkrapdyqvdvpvsedlaalyrlsgdrn
plqidpnfakgakfpkpilhgmctyglsakalidkfgmfneikarftgivfpgetlrvla
wkesddtivfqthvvdrgtiainnaaiklvgd