>1xu1D (D:) observed residues (from ATOM records)
khsvlhlvpvnitskadsdvtevmwqpvlrrgrgleaqgdivrvwdtgiyllysqvlfhd
vtftmgqvvsregqgrretlfrcirsmpsdpdraynscysagvfhlhqgdiitvkipran
aklslsphgtflgfvkl