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which a complex breaks down into x A subunits and y B subunits, the dissociation constant is defined as

:

where [A], [B], and [A_x B_y] are the equilibrium concentrations of A, B, and the complex A_x B_y, respectively.

One reason for the popularity of the dissociation constant in biochemistry and pharmacology is that in the frequently encountered case where x = y = 1, K_D has a simple physical interpretation: when [A] = K_D, then

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