Hypogonadotropic Hypogonadism 16 with or Without Anosmia, also known as hh16, is related to hypogonadotropic hypogonadism 2 with or without anosmia and hirschsprung disease 1. An important gene associated with Hypogonadotropic Hypogonadism 16 with or Without Anosmia is SEMA3A (Semaphorin 3A), and among its related pathways/superpathways are Nervous system development and Semaphorin interactions. Affiliated tissues include pituitary and olfactory bulb, and related phenotypes are primary amenorrhea and decreased serum estradiol