Chains and heterogens:
PDB Chain Sequences:
>1tx4A (A:) plpnqqfgvslqhlqeknpeqepipivlretvaylqahalttegifrrsantqvvrevqq kynmglpvdfdqynalhlpavilktflrelpeplltfdlyphvvgflnidesqrvpatlq vlqtlpeenyqvlrfltaflvqisahsdqnkmtntnlavvfgpnllwakdaaitlkainp intftkflldhqgelf
>1tx4B (B:) airkklvivgdgacgktcllivnskdqfpevyvptvfenyvadievdgaqvelalwdtag qedydrlrplsypdtdvilmcfsidspdslenipekwtpevkhfcpnvpiilvgnkkdlr ndehtrrelakmkqepvkpeegrdmanrigafgymecsaktkdgvrevfematraal
>1tx4B (B:) airkklvivgdgacgktcllivnskdqfyvptvfenyvadievdgkqvelalwdtagqed ydrlrplsypdtdvilmcfsidspdslenipekwtpevkhfcpnvpiilvgnkkdlrnde htrrelakmkqepvkpeegrdmanrigafgymecsaktkdgvrevfematraal