Chains and heterogens:
PDB Chain Sequences:
>1ni2A (A:) pkpinvrvttmdaelefaiqpnttgkqlfdqvvktiglrevwyfglhyvdnkgfptwlkl dkkvsaqevrkenplqfkfrakfypedvaeeliqditqklfflqvkegilsdeiycppet avllgsyavqakfgdynkevhksgylsserlipqrvmdqhkltrdqwedriqvwhaehrg mlkdnamleylkiaqdlemyginyfeiknkkgtdlwlgvdalglniyekddkltpkigfp wseirnisfndkkfvikpidkkapdfvfyaprlrinkrilqlcmgnhelymrrrkp
>1ni2B (B:) pkpinvrvttmdaelefaiqpnttgkqlfdqvvktiglrevwyfglhyvdnkgfptwlkl dkkvsaqevrkenplqfkfrakfypedvaeeliqditqklfflqvkegilsdeiycppet avllgsyavqakfgdynkevhksgylsserlipqrvmdqhkltrdqwedriqvwhaehrg mlkdnamleylkiaqdlemyginyfeiknkkgtdlwlgvdalglniyekddkltpkigfp wseirnisfndkkfvikpidkkapdfvfyaprlrinkrilqlcmgnhelymrrrkp