Table 2.

Labyrinthine proportions of B6 and CD1 placentas

	CD1 Mice		B6 Mice
	E15.5	E17.5	E15.5	E17.5
No. of placentas/group	5	6	6	5
Fetal capillaries	15.6 ± 0.6a	25.7 ± 1.5b	19.4 ± 1.9	20.0 ± 1.1*
Maternal blood space	26.6 ± 3.0	25.8 ± 1.1	24.9 ± 2.2	26.8 ± 2.5
Other	57.9 ± 2.8a	48.5 ± 1.9b	55.7 ± 2.2	53.1 ± 2.0

Data are means ± SE (in %).

^a,bDifferent letters show a significant difference between gestational ages (P < 0.05);

^*P < 0.05, significant difference between strains at the same gestational age as determined by two-way ANOVA followed by Tukey post hoc tests.