postnatal day 0 出生当天
The birth weight of all male and female offspring rats were measured on postnatal day 2.
于出生第2天，测定所有仔鼠的出生体质量。
The reaction decreased with the development of nephrons, however, moderate reaction was still observed on 30th postnatal day in S_3 segment.
随着肾单位的发育，免疫反应虽有所减弱，但生后第30天仍可看到中等强度的反应。
Rats of postnatal day 13 (PN13) in experiment group were selected, and models of forepaw sensorimotor deprivation were established by microsurgical technique.
取13日龄（PN13）实验组大鼠，运用显微外科技术建立幼鼠前爪感觉和精细动作剥夺模型。
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