Chains and heterogens:
PDB Chain Sequences:
>1sftA (A:) ndfhrdtwaevdldaiydnvenlrrllpddthimavvkanayghgdvqvartaleagasr lavafldealalrekgieapilvlgasrpadaalaaqqrialtvfrsdwleeasalysgp fpihfhlkmdtgmgrlgvkdeeetkrivalierhphfvleglythfatadevntdyfsyq ytrflhmlewlpsrpplvhcansaaslrfpdrtfnmvrfgiamyglapspgikpllpypl keafslhsrlvhvkklqpgekvsygatytaqteewigtipigyadgwlrrlqhfhvlvdg qkapivgricmdqcmirlpgplpvgtkvtligrqgdevisiddvarhletinyevpctis yrvpriffrhkrimevrnaiga
>1sftB (B:) ndfhrdtwaevdldaiydnvenlrrllpddthimavvkanayghgdvqvartaleagasr lavafldealalrekgieapilvlgasrpadaalaaqqrialtvfrsdwleeasalysgp fpihfhlkmdtgmgrlgvkdeeetkrivalierhphfvleglythfatadevntdyfsyq ytrflhmlewlpsrpplvhcansaaslrfpdrtfnmvrfgiamyglapspgikpllpypl keafslhsrlvhvkklqpgekvsygatytaqteewigtipigyadgwlrrlqhfhvlvdg qkapivgricmdqcmirlpgplpvgtkvtligrqgdevisiddvarhletinyevpctis yrvpriffrhkrimevrnai