CD24, also known as the cluster of differentiation 24, is a highly glycosylated glycosylphosphatidylinositol （GPI）-anchored surface protein that plays crucial roles in various physiological and pathological processes. Initially identified as a B-cell differentiation antigen, it is widely expressed in hematopoietic stem cells, B and T lymphocytes, epithelial cells, and neural cells. Structurally, CD24 has an intracellular domain, a transmembrane domain, and a heavily glycosylated extracellular domain, which is involved in cell adhesion, migration, differentiation, and apoptosis.