Figure 1From: Steroidogenic capacity of the placenta as a supplemental source of progesterone during pregnancy in domestic catsProgesterone values in blood of queens at early, mid and late pseudopregnancy or early, mid and late pregnancy. Letters “a, b” indicate statistical differences among groups. Asterisks indicate statistical differences in P4 levels between groups within pregnancy or pseudopregnancy conditions (*P < 0.05, **P < 0.01).Back to article page