Hypogonadotropic Hypogonadism 27 Without Anosmia, is also known as hh27. An important gene associated with Hypogonadotropic Hypogonadism 27 Without Anosmia is NHLH2 (Nescient Helix-Loop-Helix 2). Affiliated tissues include pituitary and heart, and related phenotypes are obesity and anosmia