Chains and heterogens:
PDB Chain Sequences:
>1irk_ (-) ssvfvpdewevsrekitllrelgqgsfgmvyegnardiikgeaetrvavktvnesaslre rieflneasvmkgftchhvvrllgvvskgqptlvvmelmahgdlksylrslrpeaennpg rppptlqemiqmaaeiadgmaylnakkfvhrdlaarncmvahdftvkigdfgmtrdiyet dyyrkggkgllpvrwmapeslkdgvfttssdmwsfgvvlweitslaeqpyqglsneqvlk fvmdggyldqpdncpervtdlmrmcwqfnpkmrptfleivnllkddlhpsfpevsffhse enk