Chains and heterogens:
PDB Chain Sequences:
>1iswA (A:) aestlgaaaaqsgryfgtaiasgklgdsayttiasrefnmvtaenemkidatepqrgqfn fsagdrvynwavqngkqvrghtlawhsqqpgwmqslsgstlrqamidhingvmghykgki aqwdvvneafsddgsggrrdsnlqrtgndwievafrtaraadpaaklcyndynienwtwa ktqgvynmvrdfkqrgvpidcvgfqshfnsgspynsnfrttlqnfaalgvdvaiteldiq gassstyaavtndclavsrclgitvwgvrdtdswrsgdtpllfngdgskkaaytavlnal nggsstpppsgggqikgvgsgrcldvpnasttdgtqvqlydchsatnqqwtytdagelrv ygdkcldaagtgngtkvqiyscwggdnqkwrlnsdgsivgvqsglcldavgggtangtli qlyscsngsnqrwtrt
>1iswB (B:) aestlgaaaaqsgryfgtaiasgklgdsayttiasrefnmvtaenemkidatepqrgqfn fsagdrvynwavqngkqvrghtlawhsqqpgwmqslsgstlrqamidhingvmghykgki aqwdvvneafsddgsggrrdsnlqrtgndwievafrtaraadpaaklcyndynienwtwa ktqgvynmvrdfkqrgvpidcvgfqshfnsgspynsnfrttlqnfaalgvdvaiteldiq gassstyaavtndclavsrclgitvwgvrdtdswrsgdtpllfngdgskkaaytavlnal nggsstpppsgggqikgvgsgrcldvpnasttdgtqvqlydchsatnqqwtytdagelrv ygdkcldaagtgngtkvqiyscwggdnqkwrlnsdgsivgvqsglcldavgggtangtli qlyscsngsnqrwtrt