Stereoview of the position of copper relative to the equatorial plane formed by ligands from Cys92, His 95 and His53 in native, M98A and M98Q amicyanins. The three structures are superimposed on the copper-coordinated ligand atoms ND1 of His53 and His95 and the SG of Cys92. These atoms are connected by dashed lines to illustrate the equatorial plane. The carbon and copper atoms of wild type, Ala98 and Gln98 are yellow, pink and purple, respectively. The sulfur, oxygens and nitrogens are green, red and blue, respectively.