Chains and heterogens:
PDB Chain Sequences:
>1n40A (A:) mtatvllevpfsargdripdavaelrtrepirkvrtitgaeawlvssyalctqvledrrf smketaaagaprlnaltvppevvnnmgniadaglrkavmkaitpkapgleqflrdtansl ldnlitegapadlrndfadplatalhckvlgipqedgpklfrslsiafmssadpipaaki nwdrdieymagilenpnittglmgelsrlrkdpayshvsdelfatigvtffgagvistgs flttalisliqrpqlrnllhekpelipagveellrinlsfadglprlatadiqvgdvlvr kgelvlvlleganfdpehfpnpgsieldrpnptshlafgrgqhfcpgsalgrrhaqigie allkkmpgvdlavpidqlvwrtrfqrriperlpvlw
>1n40A (A:) tatvllevpfsargdripdavaelrtrepirkvrtitgaeawlvssyalctqvledrrfs mketaaagaprlnaltvppevvnnmgniadaglrkavmkaitpkapgleqflrdtansll dnlitegapadlrndfadplatalhckvlgipqedgpklfrslsiafmssadpipaakin wdrdieymagilenpnittglmgelsrlrkdpayshvsdelfatigvtffgagvistgsf lttalisliqrpqlrnllhekpelipagveellrinlsfadglprlatadiqvgdvlvrk gelvlvlleganfdpehfpnpgsieldrpnptshlafgrgqhfcpgsalgrrhaqigiea llkkmpgvdlavpidqlvwrtrfqrriperlpvlw