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An allosteric protein demonstrates a decrease in its Kd for molecule Y as the concentration of...

An allosteric protein demonstrates a decrease in its Kd for molecule Y as the concentration of molecule X increases. Based on this information which of the following statements is true?

X is a homotropic positive modulator.

X is a heterotropic positive modulator.

X is a homotropic negative modulator.

X is a heterotropic negative modulator.

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