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
Hong Kong-style milk tea of Ceylon tea), evaporated milk, and sugar, the last of which is added by the customers themselves unless in the case of take-away. A variety uses condensed milk instead of milk and sugar, giving the tea a richer feel. To make the tea, water and tea (about 1 to 3 teaspoons of tea a cup, depending how strong the drinker likes) are brought to a boil then simmered for about 3–6 minutes. The tea is usually put in a sackcloth bag before the water is added to the pot to filter it out or if no bag available poured through