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. 2011 Oct 25;302(2):E233–E242. doi: 10.1152/ajpendo.00192.2011

Fig. 1.

Fig. 1.

Impact of maternal age on placental system A activity. A: placental system A activity was significantly lower in placentas of primiparous teenagers (n = 31) vs. primiparous adults (n = 13). B: system A activity was significantly reduced in placentas from adults delivering small-for-gestational-age (SGA) infants (n = 6) vs. appropriate-for-gestational-age (AGA) infants (n = 12). There was no significant difference in system A activity in placentas of AGA (n = 26) and SGA (n = 6) infants delivered to teenagers. Teenagers delivering both AGA and SGA infants had comparable placental system A activity to adults delivering SGA infants and significantly lower activity than AGA infants delivered to adults. Values are means ± SE. Least squares linear regression: *P < 0.05 AGA vs. SGA in adults; and AGA (Teenagers) and SGA (Teenagers) vs. AGA (Adults).