>1xk9A (A:) observed residues (from ATOM records)
eflgdggdvsfstrgtqnwtverllqahrqleergyvfvgyhgtfleaaqsivfggvrar
sqdldaiwrgfyiagdpalaygyaqdqepdargrirngallrvyvprsslpgfyrtsltl
aapeaageverlighplplrldaitgpeeeggrletilgwplaertvvipsaiptdprnv
ggdldpssipdkeqaisalpdyas