>1xn1F (F:) observed residues (from ATOM records)
tsfkiafiqarwhadivdearksfvaelaaktggsveveifdvpgayeiplhaktlartg
ryaaivgaafvidggiyrhdfvatavingmmqvqletevpvlsvvltphhfheskehhdf
fhahfkvkgveaahaalqivsersriaa