The FCRN protein is a cell surface receptor that conveys passive humoral immunity through the selective uptake of monomeric IgG in milk. FCGRT-B2M Heterodimer Protein, Mouse (Biotinylated, HEK293, His) is a recombinant protein dimer complex containing mouse-derived FCGRT-B2M Heterodimer protein, expressed by HEK293 , with C-His labeled tag. FCGRT-B2M Heterodimer Protein, Mouse (Biotinylated, HEK293, His), has molecular weight of ~44.2 kDa.