Chains and heterogens:
PDB Chain Sequences:
>1i6kA (A:) mktifsgiqpsgvitignyigalrqfvelqheyncyfcivdqhaitvwqdphelrqnirr laalylavgidptqatlfiqsevpahaqaawmlqcivyigelermtqfkeksagkeavsa glltypplmaadillyntdivpvgedqkqhieltrdlaerfnkrygelftipearipkvg arimslvdptkkmsksdpnpkayitllddaktiekkiksavtdsegtirydkeakpgisn llniystlsgqsieelerqyegkgygvfkadlaqvvietlrpiqeryhhwmeseeldrvl degaekanrvasemvrkmeqamglgrrr
>1i6kA (A:) mktifsgiqpsgvitignyigalrqfvelqheyncyfcivdqhaitvwqdphelrqnirr laalylavgidptqatlfiqsevpahaqaawmlqcivyigelermtqfkeksagkeavsa glltypplmaadillyntdivpvgedqkqhieltrdlaerfnkrygelftipearipkvg arimslvdptkkmsksdpnpkayitllddaktiekkiksavtdsegtirydkeakpgisn llniystlsgqsieelerqyegkgygvfkadlaqvvietlrpiqeryhhwmeseeldrvl degaekanrvasemvrkmeqamglgr