Mammary gland gestation, serum progesterone remains at a stably high concentration so signaling through its receptor is continuously activated. As one of the transcribed genes, Wnts secreted from mammary epithelial cells act paracrinely to induce more neighboring cells' branching. When the lactiferous duct tree is almost ready, "leaves" alveoli are differentiated from luminal epithelial cells and added at the end of each branch. In late pregnancy and for the first few days after giving birth, colostrum is secreted. Milk secretion (lactation) begins a few days later due to reduction in circulating progesterone and the presence of another important hormone prolactin, which mediates
You Don't Know What Love Is (You Just Do as You're Told) You Don't Know What Love Is (You Just Do as You're Told) "You Don't Know What Love Is (You Just Do as You're Told)" is a song written and recorded by the American alternative rock band The White Stripes. The song was first played live on June 29, 2007 in Calgary, Alberta, Canada, and is the second track from their sixth studio album "Icky Thump". The track was released as a CD single on September 18, 2007, with the 7" vinyl version of the single following on September 25. The music video for "You Don't Know What Love Is (You