Table 1.

Summary of primary MEC receptor protein expression during pregnancy

	IRβ (ng)	IGF-1Rβ (ng)	Hybrid (ng)	% IGF-1Rβ in hybrid
P5	15.3 ± 1.8a	4.3 ± 0.3c,d	2.0 ± 0.1	48.9 ± 2.1
P12	27.6 ± 4.0a,b	3.9 ± 0.4c,d	2.4 ± 0.1	62.7 ± 5.8
P18	25.7 ± 5.1a	2.5 ± 0.1	2.0 ± 0.2	79.0 ± 9.4e

Values are mean± sem nanograms of receptor protein per 10 μg total cell protein. Percent IGF-1R in hybrid = (nanograms hybridR/total nanograms IGF-1R) × 100. 

^aP ≤ 0.01 vs. IGF-1R and hybrid at same time point; 

^bP ≤ 0.05 vs. IR at P5; 

^cP ≤ 0.03 vs. hybridR at same time point; 

^dP ≤ 0.005 vs. IGF-1R at P18; 

^eP = 0.01 vs. % IGF-1R at P5 by ANOVA.