Chains and heterogens:
PDB Chain Sequences:
>1xx6A (A:) myrpkdhgwvevivgpmysgkseelirrirrakiakqkiqvfkpeidnryskedvvshmg ekeqavaiknsreilkyfeedteviaidevqffddeiveivnkiaesgrrvicagldmdf rgkpfgpipelmaiaefvdkiqaicvvcgnpatrtqrlingkpafyddpvvligamesye arcrkchvvpq
>1xx6A (A:) yrpkdhgwvevivgpmysgkseelirrirrakiakqkiqvfkpeedvvshmgekeqavai knsreilkyfeedteviaidevqffddeiveivnkiaesgrrvicagldmdfrgkpfgpi pelmaiaefvdkiqaicvvcgnpatrtqrlingkpafyddpvmesyearcrkchvvpq
>1xx6B (B:) myrpkdhgwvevivgpmysgkseelirrirrakiakqkiqvfkpeidnryskedvvshmg ekeqavaiknsreilkyfeedteviaidevqffddeiveivnkiaesgrrvicagldmdf rgkpfgpipelmaiaefvdkiqaicvvcgnpatrtqrlingkpafyddpvvligamesye arcrkchvvpq
>1xx6B (B:) yrpkdhgwvevivgpmysgkseelirrirrakiakqkiqvfkpeavaiknsreilkyfee dteviaidevqffddeiveivnkiaesgrrvicagldmdfrgkpfgpipelmaiaefvdk iqaicvvcgnpatrtqrlingkpafyddpvmesyearcrkchvvpq