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
Just a Song Before I Go Just a Song Before I Go "Just a Song Before I Go" is a song by Crosby, Stills and Nash that appeared on the 1977 album "CSN". It was also released as a single and reached number seven on the "Billboard" singles charts, becoming the band's highest charting hit. It is also one of the band's shortest songs, with a running time of only 2:14. In Canada, it peaked at number 10. The song was written by Graham Nash about leaving loved ones behind before going on a concert tour. It was written in Hawaii in about 20 minutes at