18 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb 1a6dA.pdb