Chains and heterogens:
PDB Chain Sequences:
>1r9gA (A:) mgsshhhhhhssglvprgshmltigvlglqgavrehihaieacgaaglvvkrpeqlnevd glilpggesttmrrlidtyqfmeplrefaaqgkpmfgtcagliilakeiagsdnphlgll nvvvernsfgrqvdsfeadltikgldepftgvfiraphileagenvevlsehngrivaak qgqflgcsfhpeltedhrvtqlfvemveeykqkalv
>1r9gA (A:) mltigvlglqgavrehihaieacgaaglvvkrpeqlnevdglilpggesttmrrlidtyq fmeplrefaaqgkpmfgtcagliilakeiagsdnphlgllnvvvernsfgrqvdsfeadl tikgldepftgvfiraphileagenvevlsehngrivaakqgqflgcsfhpeltedhrvt qlfvemveeykqkalv
>1r9gB (B:) mgsshhhhhhssglvprgshmltigvlglqgavrehihaieacgaaglvvkrpeqlnevd glilpggesttmrrlidtyqfmeplrefaaqgkpmfgtcagliilakeiagsdnphlgll nvvvernsfgrqvdsfeadltikgldepftgvfiraphileagenvevlsehngrivaak qgqflgcsfhpeltedhrvtqlfvemveeykqkalv
>1r9gB (B:) mltigvlglqgavrehihaieacgaaglvvkrpeqlnevdglilpggesttmrrlidtyq fmeplrefaaqgkpmfgtcagliilakeiagsdnphlgllnvvvernsfgrqvdsfeadl tikgldepftgvfiraphileagenvevlsehngrivaakqgqflgcsfhpeltedhrvt qlfvemveeykqkalv