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What is the dissociation constant, Kd, of a ligand with a percent occupancy (or fractional saturation) of 50% when [ligand] = 10-7 M? HINT; Theta = (ligand) / ((ligand) + Kd) where ? represents the fraction of binding sites that are occupied. (Note that some textbooks use the term v or Y, instead of ?, to denote fractional saturation.)

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