Changes in plasma progesterone levels during the estrous cycle and pregnancy in 4-day cyclic mice.
Changes in plasma progesterone levels during the estrous cycle and pregnancy were determined in group-housed IVCS strain mice showing regular 4-day cycles in the absence of a male. The pattern of progesterone secretion during the estrous cycle consisted of a large peak and a small one, the former during the late afternoon of proestrus and the latter on the afternoon of metestrus. From Day 0 to Day 2 of pregnancy, a sharp rise was observed, and then this level reached a plateau. A marked increase in progesterone was shown from Day 13 until the day before parturition.
Toxicology Division, Institute of Environmental Toxicology, Tokyo, Japan.
T
T
Kosaka
T R
TR
Saito
K W
KW
Takahashi
D000818:Animals; D004971:Estrus; D005260:Female; D051379:Mice; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000097:blood*; D011374:Progesterone / Q000097:blood*
D011374:Progesterone