Chains and heterogens:
PDB Chain Sequences:
>4k3vA (A:) mkklvplllallllvaacgtggkqssdksngklkvvttnsilydmaknvggdnvdihsiv pvgqdpheyevkpkdikkltdadvilynglnletgngwfekaleqagkslkdkkviavsk dvkpiylngeegnkdkqdphawlsldngikyvktiqqtfidndkkhkadyekqgnkyiaq leklnndskdkfndipkeqramitsegafkyfskqygitpgyiweintekqgtpeqmrqa iefvkkhklkhllvetsvdkkameslseetkkdifgevytdsigkegtkgdsyykmmksn ietvhgsmk
>4k3vA (A:) gklkvvttnsilydmaknvggdnvdihsivpvgqdpheyevkpkdikkltdadvilyngl nletgngwfekaleqagkslkdkkviavskdvkpiylndkqdphawlsldngikyvktiq qtfidndkkhkadyekqgnkyiaqleklnndskdkfndipkeqramitsegafkyfskqy gitpgyiweintekqgtpeqmrqaiefvkkhklkhllvetgevytdsigkegtkgdsyyk mmksnietvhgsm
>4k3vB (B:) mkklvplllallllvaacgtggkqssdksngklkvvttnsilydmaknvggdnvdihsiv pvgqdpheyevkpkdikkltdadvilynglnletgngwfekaleqagkslkdkkviavsk dvkpiylngeegnkdkqdphawlsldngikyvktiqqtfidndkkhkadyekqgnkyiaq leklnndskdkfndipkeqramitsegafkyfskqygitpgyiweintekqgtpeqmrqa iefvkkhklkhllvetsvdkkameslseetkkdifgevytdsigkegtkgdsyykmmksn ietvhgsmk
>4k3vB (B:) gklkvvttnsilydmaknvggdnvdihsivpvgqdpheyevkpkdikkltdadvilyngl nletgngwfekaleqagkslkdkkviavskdvkpiylngeegnkdkqdphawlsldngik yvktiqqtfidndkkhkadyekqgnkyiaqleklnndskdkfndipkeqramitsegafk yfskqygitpgyiweintekqgtpeqmrqaiefvkkhklkhllvetsvdkkameslseet kkdifgevytdsigkegtkgdsyykmmksnietvhgsm