>3kxsF (F:) observed residues (from ATOM records)
mdidpykefgatvellsflpsdffpsvrdlldtaaalyrdalespehcsphhtalrqail
cwgdlmtlatwvgtnledpasrdlvvsyvntnvglkfrqllwfhiscltfgretvleylv
sfgvwirtppaarppnapilst