>1xk3A (A:) observed residues (from ATOM records)
pqdlsealkeatkevhtqaenaefmrnfqkgqvtrdgfklvmaslyhiyvaleeeiernk
espvfapvyfpeelhrkaaleqdlafwygprwqevipytpamqryvkrlhevgrtepell
vahaytrylgdlsggqvlkkiaqkaldlpssgeglafftfpniasatkfkqlyesrmnsl
emtpavrqrvieeaktafllniqlfeelqellth