>3a68U (U:) observed residues (from ATOM records)
ifepfeevkkeldlvptvpqaslarqkyvdesesavneqinveynvsyvyhamfayfdrd
nvalrglakffkesseeerehaeklmeyqnkrggkvklqsivmplsdfdhadkgdalham
elalslekltnekllnlhsvatkngdvqladfveteylgeqveaikriseyvaqlrrvgk
ghgvwhfdqmllhe