ANOS1 and hypogonadotropic hypogonadism: Mutations on the X chromosome are also linked with male infertility including: anosmin 1 (ANOS1), a gene linked to Kallmann syndrome (71), testis expressed 11 (TEX11), linked to meiotic arrest (72) and nuclear receptor subfamily 0 group B member 1 (NR0B1) associated with adrenal hyperplasia and hypogonadotropic hypogonadism (73).