The function of ENSG00000131808 (FSHB, follicle stimulating hormone subunit beta) is as follows. Together with the alpha chain CGA constitutes follitropin, the follicle-stimulating hormone, and provides its biological specificity to the hormone heterodimer. Binds FSHR, a G protein-coupled receptor, on target cells to activate downstream signaling pathways (PubMed:24692546, PubMed:2494176). Follitropin is involved in follicle development and spermatogenesis in reproductive organs (PubMed:407105, PubMed:8220432). {ECO:0000269|PubMed:24692546, ECO:0000269|PubMed:2494176, ECO:0000269|PubMed:407105, ECO:0000269|PubMed:8220432}.