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The effect of subcutaneous injection of nicotine in maternal rats on fetal body weight. Control: the control animals; early: maternal s.c. nicotine from GD 3 to 21; middle: maternal s.c. nicotine from GD 9 to 21; late: maternal s.c. nicotine from GD 15 to 21. * and #p<0.05; * vs. the Control; # vs. the late group.
