Chains and heterogens:
PDB Chain Sequences:
>4ktkA (A:) tatvllevpfsargdripdavaelrtrepirkvrtitgaeawlvssyalctqvledrrfs mketaaagaprlnaltvppevvnnmgniadaglrkavmkaitpkapgleqflrdtansll dnlitegapadlrndfadplatalhckvlgipqedgpklfrslsiafmssadpipaakin wdrdieymagilenpnittglmgelsrlrkdpayshvsdelfatigvtffgagvistgsf lttalisliqrpqlrnllhekpelipagveellrinlsfadglprlatadiqvgdvlvrk gelvlvlleganfdpehfpnpgsieldrpnptshlafgrgqhfcpgsalgrrhaqigiea llkkmpgvdlavpidqlvwrtrfqrriperlpvlw