Animals 2 Follicle Stimulating Hormone 2 Genotype 2 Gonadotropins 2 Infertility, Male 2 Luteinizing Hormone 2 Male 2 Mice 2 Mice, Transgenic 2 Phenotype 2 Receptors, FSH 2 Receptors, LH 2 Reproduction 2 Review 2 Signal Transduction 2 androgen therapy 2 animal 2 chorionic gonadotropin 2 follitropin 2 follitropin receptor 2 gain of function mutation 2 genetically engineered mouse strain 2 genetics 2 genotype 2 gonadotropin 2 hormone action 2 loss of function mutation 2 luteinizing hormone 2 luteinizing hormone receptor 2 male 2