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
The Mammal Society problem that mammals in the British Isles are severely under-recorded, resulting in a lack of mammal conservation progress. The Mammal Society is determined to overcome this by creating a National Mammal Atlas, the first in over 20 years, to provide vital information on mammal distribution and abundance so that informed conservation decisions can be made for species in need. In order to achieve this they are collating national mammal data and records to gather up to date information. The Mammal Society offers a wide range of expert-led training courses for consultants, conservationists and enthusiasts alike, covering ecology, technical skills and