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Expression of DA receptors begins early in fetal development and persists in the postnatal gut. DA receptor expression was analyzed by reverse transcription-PCR in the stomach and small intestine from fetal day E10 through postnatal day P1. Transcripts encoding DA receptors D1–D4 were detected as early as E10 in both the presumptive stomach and small intestine. Transcripts encoding D5 were not detected in either organ until E14. Expression of each receptor was detected through P1.
