>3fw4A (A:) observed residues (from ATOM records)
sdlipapplskvplqqnfqdnqfqgkwyvvglagnailredkdpqkmyatiyelkedksy
nvtsvlfrkkkcdywirtfvpgsqpgeftlgniksypgltsylvrvvstnynqhamvffk
kvsqnreyfkitlygrtkeltselkenfirfskslglpenhivfpvpidqcidg