Scanning electron micrograph of progesterone crystals. Progesterone is a female steroid sex hormone that is secreted by the corpus luteum to prepare the endometrium for implantation. During pregnancy, the placenta secretes it to prevent rejection of the developing embryo or fetus. (c) Cmeabg - Ucbl1
Credit
ISM
/ CTµ - UCBL
Dimensions
3008 x 3655 pixels
Print Size @ 300 dpi
10 x 12 inches / 25 x 31 cm