Abstract
In rabbits pregnancy causes a marked increase in the renin concentration of plasma and several organs: uterus, vagina, mesometrium, liver, ureter, heart, arteries and veins, muscle and fat tissue, while the renin content of the kidney, oviduct, ovary and adrenal gland is the same in pregnant and non‐pregnant rabbits. There is evidence for a local renin formation in kidney, uterus, oviduct and in the chorion and amnion. The occurrence of renin in the other tissues may either be a result of local formation or due to uptake of circulating renin. The rabbit brain is not found to contain measurable amounts of renin.

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