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The SigmaA-weighted electron density 2m|Fo| − D|Fc| contoured at 1.2 σ and the atomic model are shown depicting the Ca2+-binding site found at the hyper-variable surface of n1α_LNS#2. Dotted lines indicate the interaction network between amino acid residues and solvent molecules chelating the Ca2+ ion. The binding site in Mol2 is depicted (see Table 2).
