Chains and heterogens:
PDB Chain Sequences:
>1cunA (A:) mvhqffrdmddeeswikekkllvssedygrdltgvqnlrkkhkrleaelaahepaiqsvl dtgkklsddntigkeeiqqrlaqfvdhwkelkqlaaargqrleesleyqqfvanveeeea winekmtlvasedygdtlaaiqgllkkheafetdftvhkdrvndvcangedlikknnhhv enitakmkglkgkvsdlekaaaqrkakldensa
>1cunB (B:) mvhqffrdmddeeswikekkllvssedygrdltgvqnlrkkhkrleaelaahepaiqsvl dtgkklsddntigkeeiqqrlaqfvdhwkelkqlaaargqrleesleyqqfvanveeeea winekmtlvasedygdtlaaiqgllkkheafetdftvhkdrvndvcangedlikknnhhv enitakmkglkgkvsdlekaaaqrkakldensa
>1cunC (C:) mvhqffrdmddeeswikekkllvssedygrdltgvqnlrkkhkrleaelaahepaiqsvl dtgkklsddntigkeeiqqrlaqfvdhwkelkqlaaargqrleesleyqqfvanveeeea winekmtlvasedygdtlaaiqgllkkheafetdftvhkdrvndvcangedlikknnhhv enitakmkglkgkvsdlekaaaqrkakldensa