a comparison of the concentration measured in arterial and mammary venous plasma and in milk showed that about 25 % of progesterone ( 5.7 nmol/min ) was extracted by the mammary gland , and that substantial amounts of immunoreactive metabolites of progesterone are secreted into milk with only small quantities being transferred into mammary vein plasma .
C0929301
mammary gland
C0006141
mammary