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Effect of postnatal age on PRA responses to ACh. ACh caused dilation of PRA from 5- to 7-day-old (n = 12 PRA from 12 piglets) and 12-day-old piglets (n = 7 PRA from 7 piglets) but did not induce dilation in PRA from 2-day-old piglets (n = 10 PRA from 5 piglets). *P ≤ 0.002, different from 2-day-old.
