Chains and heterogens:
PDB Chain Sequences:
>1xtjA (A:) gspghmssgfrdfllkpellraivdcgfehpsevqhecipqailgmdvlcqaksgmgkta vfvlatlqqlepvtgqvsvlvmchtrelafqiskeyerfskympnvkvavffgglsikkd eevlkkncphivvgtpgrilalarnkslnlkhikhfildecdkmleqldmrrdvqeifrm tphekqvmmfsatlskeirpvcrkfmqdpmeifvddetkltlhglqqyyvklkdneknrk lfdlldvlefnqvvifvksvqrcialaqllveqnfpaiaihrgmpqeerlsryqqfkdfq rrilvatnlfgrgmdiervniafnydmpedsdtylhrvaragrfgtkglaitfvsdenda kilndvqdrfevniselpdeidissy
>1xtjA (A:) sgfrdfllkpellraivdcgfehpsevqhecipqailgmdvlcqaksgmgktavfvlatl qqlepvtgqvsvlvmchtrelafqiskeyerfskympnvkvavffgglsikkdeevlkkn cphivvgtpgrilalarnkslnlkhikhfildecdkmleqldmrrdvqeifrmtphekqv mmfsatlskeirpvcrkfmqdpmeifvddetkltlhglqqyyvklkdneknrklfdlldv lefnqvvifvksvqrcialaqllveqnfpaiaihrgmpqeerlsryqqfkdfqrrilvat nldiervniafnydmpedsdtylhrvaragrfgtkglaitfvsdendakilndvqdrfev niselpdeidissy