>1z53A (A:) observed residues (from ATOM records)
tplvhvasvekgrsyedfqkvynaialklreddeydnyigygpvlvrlawhtsgtwdkhd
ntggsyggtyrfkkefndpsnaglqngfkflepihkefpwissgdlfslggvtavqemqg
pkipwrcgrvdtpedttpdngrlpdadkdadyvrtffqrlnmndrevvalmgahalgkth
lknsgyegpwgaannvftnefylnllnedwklekndanneqwdsksgymmlptdysliqd
pkylsivkeyandqdkffkdfskafekllengitfpkdapspfifktleeqgl