判断题

Protein kinase A itself is different in different cell types, which explains why the effects of cyclic AMP vary depending on the target cell.

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判断题

How is it that different cells can respond in different ways to exactly the same signaling molecule even when they have identical receptors

判断题

There is no fundamental distinction between signaling molecules that bind to cell-surface receptors and those that bind to intracellular receptors.