>1p73B (B:) observed residues (from ATOM records)
mvtivriyldgvygigksttgrvmasaasggsptlyfpepmaywrtlfetdvisgiydtq
nrkqqgnlavddaalitahyqsrfttpylilhdhtctlfggnslqrgtqpdltlvfdrhp
vastvcfpaaryllgdmsmcalmamvatlprepqggnivvttlnveehirrlrtrarige
qiditliatlrnvyfmlvntchflrsgrvwrdgwgelptsaykhratqmdafqervspel
gdtlfalfktqellddrgvilevhawaldalmlklrnlnvfsadlsgtprqcaavvesll
plmsstlsdfdsasaleraartfnaemgv