To do this, they subjected animals to conditioned tasteaversion training. Taste aversions have evolved in many animals to help them avoid toxic substances.
为了做这个实验，他们使动物产生条件味觉厌恶，在许多动物中这种味觉厌恶使得他们能够回避毒性物质。
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Objective To investigate the effect of conditioned tasteaversion (CTA) acquisition and retention on the expression of endogenous leu-enkephalin (LEK) in rats.