>1xtkA (A:) observed residues (from ATOM records)
gfrdfllkpellraivdcgfehpsevqhecipqailgmdvlcqaksgmgktavfvlatlq
qlepvtgqvsvlvmchtrelafqiskeyerfskympnvkvavffgglsikkdeevlkknc
phivvgtpgrilalarnkslnlkhikhfildeadkmleqldmrrdvqeifrmtphekqvm
mfsatlskeirpvcrkfmqdpmeifvddetkltlhglqqyyvklkdneknrklfdlldvl
efnqvvifvksvqrcialaqllveqnfpaiaihrgmpqeerlsryqqfkdfqrrilvatn
lfgrgmdiervniafnydmpedsdtylhrvaragrfgtkglaitfvsdendakilndvqd
rfevniselpdeidissyieqt