PDB ID:4X68 Metal site ID: 4X68-NI-1 Bound amino acids or nucleotide residues: D2 Group identifier: D2L1 Is homomeric: True Amino acid or nucleotide residue IDs: ASP A.149 ASP B.360 All ligands IDs: ASP A.149 ASP B.360 Number of coordinating amino acids or nucleotide residues: 2 Number of coordinating ligands: 2 Number of coordinating chains: 2 Number of coordinating chains: 2