CD320 antigen (CD320)

Receptor for transcobalamin saturated with cobalamin (TCbl) (PubMed:18779389). Plays an essential role in cobalamin uptake (PubMed:18779389, PubMed:20524213).

Plasma membrane protein that is expressed on follicular dendritic cells (FDC) and mediates interaction with germinal centre B cells (PubMed:10727470). Functions as costimulator to promote B cell responses to antigenic stimulation; promotes B cell differentiation and proliferation (PubMed:10727470, PubMed:11418631).