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1)How many different subtypes of DA receptors exist? How are these subtypes grouped into families? Discuss the differences between D1 and D2 receptors with respect to signaling mechanisms and affinity for DA

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1)How many different subtypes of DA receptors exist? How are these subtypes grouped into families? Discuss the differences between D1 and D2 receptors with respect to signaling mechanisms and affinity for DA.

2)Name the drugs presented in the text that act as either agonists or antagonists for D1 and D2 receptors. Then describe the behavioral effects in rats or mice of administering each drug.