FR4 is a heavily glycosylated 35 kD receptor for folic acid and the physiologic circulating form of the vitamin, N5-methyltetrahydrofolate. Natural T regs have high levels of FR4 and together with CD25 can be used to distinguish natural Tregs, effector T cells, memory-like T cells and naive T cells. In vivo studies with eBioTH6 show a decrease in the number of CD4+CD25+ cells and an enhanced tumor response leading to the elimination of advanced stages of tumors.
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Protein Aliases: Folate receptor 4; folate receptor 4 (delta); Folate receptor delta; Folate-binding protein 3; FR-delta; IZUMO1 receptor protein JUNO; probable folate receptor delta; Sperm-egg fusion protein Juno
Gene Aliases: 0910001L11Rik; C86255; Folbp3; Folr4; Izumo1r; Juno
UniProt ID: (Mouse) Q9EQF4
Entrez Gene ID: (Mouse) 64931