>5k4nA (A:) observed residues (from ATOM records)
dqrfgdpvfrqlapnvwqhtsyldmpgfgavasnglivrdggrvlmvdtagtdaqtaqil
kwikqeinlpvalavvthahqdkmggmdalhaagiatyanalsnqlapregvvaaqhslt
faatgwvepatapnfgplkvfypgpghtsdnitvgidgtdiafggclirdskakslgnld
eadtehyaasvrafgaafpkasmivmshfapdsraaithtarmadklr