>3tr4A (A:) observed residues (from ATOM records) vsagkgiddfnviieipanggevkyeydkelgfltvdrfmptsmrypcnygfvpstlaqd gdpldvlvltpvpvqpgvlmrvralgimkmedeagedskvlavpvvkacrayeaiqslkd issllldaishfferykdlepnkwakvkgwedkeaakkefeasivrfke