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Proposed model in regulation of SSC self-renewal and differentiation. BV: blood vessel; BM: basement membrane; GnRH: gonadotropin-releasing hormone; GDNF: Glial cell-derived neurotrophic factor; FSH: follicle-stimulating hormone; LH: Luteinizing hormone; SL: steel; SCF: Stem cell factor; SSC: spermatogonial stem cells.
