This product is a serum-free, animal-component-free APC cell culture medium with clearly defined ingredients, specifically optimized for the efficient in vitro culture, functional maintenance, and immunological research applications of antigen-presenting cells (APCs). Its core formulation precisely mimics the natural microenvironment of APC maturation in vivo, integrating a combination of key cytokines such as GM-CSF, IL-4, and FLT3-L. This formulation powerfully supports the directed differentiation, phenotypic maturation, and functional maintenance of APC subpopulations including dendritic cells and macrophages. It significantly enhances MHC-antigen complex presentation efficiency and co-stimulatory molecule expression levels, ensuring sustained high cellular viability, phagocytic function, and T-cell activation capacity during extended culture periods.