ITEM#: 3042-SAB5500050100UL
MFR#: SAB5500050-100UL
CD21 antigen, also known as complement receptor type 2 (CR2), is a glycoprotein and a receptor for the C3d fragment of complement component 3. It is predominantly expressed in follicular dendritic cells and B lymphocytes. CD21 binds to CD19, and CD81