Chains and heterogens:
PDB Chain Sequences:
>1fr6A (A:) aakteqqiadivnrtitplmqeqaipgmavaiiyqgkpyyftwgkadiannrpvtqqtlf elgsvsktfngvlggdaiargeiklsdpvtqywpeltgkqwqgisllhlatytagglplq vpddvtdkaallrfyqnwqpqwapgakrlyanssiglfgalavkpsgmsyeeamskrvlh plklahtwitvpqseqkdyawgyregkpvhvspgqldaeaygvkssvidmtrwvqanmda sqvqektlqqgielaqsrywrigdmyqglgwemlnwpvkadsiisgsdskvalaalpave vnppapavkaswvhktgstggfgsyvafvpeknlgivmlanksypnpvrveaawrilekl q
>1fr6B (B:) aakteqqiadivnrtitplmqeqaipgmavaiiyqgkpyyftwgkadiannrpvtqqtlf elgsvsktfngvlggdaiargeiklsdpvtqywpeltgkqwqgisllhlatytagglplq vpddvtdkaallrfyqnwqpqwapgakrlyanssiglfgalavkpsgmsyeeamskrvlh plklahtwitvpqseqkdyawgyregkpvhvspgqldaeaygvkssvidmtrwvqanmda sqvqektlqqgielaqsrywrigdmyqglgwemlnwpvkadsiisgsdskvalaalpave vnppapavkaswvhktgstggfgsyvafvpeknlgivmlanksypnpvrveaawrilekl q