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Structure of the NTD of MLV CA. (A) Monomer of the NTD of MLV CA from published coordinates of the NTD hexamer. Spheres show the locations of the CA mutants in the loop between α-helices 4 and 5. Mutant 1955 is located between amino acids G81 and D82 (gray sphere); mutants 1968 and 1970 are located between P86 and T87 (black sphere). (B) Hexamer of the NTD of MLV CA (PDB, 1U7K) (28). The dotted box outlines the monomer illustrated in panel A. Drawings were made using PyMol (9).
