>6b3sA (A:) observed residues (from ATOM records)
kkvcngigigefkdslsinatnikhfknctsisgdlhilpvafrgdsfthtppldpqeld
ilktvkeitgflliqawpenrtdlhafenleiirgrtkqhgqfslavvslnitslglrsl
keisdgdviisgnknlcyantinwkklfgtsgqktkiirnrgensckatgqvchalcspe
gcwgpeprdcv