This product is a high-end, specialized in vitro culture reagent designed to provide an optimized differentiation environment for mammalian mammary epithelial cells or mammary stem cells. It efficiently induces and supports the formation of three-dimensional, hollow mammary sphere structures (Mammospheres). Its core formulation precisely mimics the physiological conditions of in vivo mammary development. Through a scientifically balanced ratio of key growth factors and hormones, it significantly promotes the expression of mammary-specific markers (such as β-casein and lactalbumin) and perfectly reproduces the polarized structure and luminal formation capabilities of mammary epithelial cells.