>3fn1B (B:) observed residues (from ATOM records)
strrvsvrdkllvkevaeleanlpctckvhfpdpnklhcfqltvtpdegyyqggkfqfet
evpdaynmvppkvkcltkiwhpnitetgeiclsllrehsidgtgwaptrtlkdvvwglns
lftdllnfddplnieaaehhlrdkedfrnkvddyikryar