>2gs4A (A:) observed residues (from ATOM records) mktiedvfihllsdtysaekqltralaklaratsneklsqafhahleethgqieridqvv esesnlkikrmkcvameglieeaneviesteknevrdaaliaaaqkvehyeiasygtlat laeqlgyrkaakllketleeekatdikltdlainnvnkk