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What is the significance of the discovery of different hormone receptor types for the hormone epinephrine?

A) Two types of epinephrine hormone response elements were identified.

B) Different tissues responded differently to the presence of epinephrine.

C) It was discovered that slightly different forms of epinephrine (agonists) were secreted by the adrenal glands.

D) All target tissues for epinephrine possess all four types of epinephrine receptors.