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Intersexuality is a collection of conditions where biological sex often cannot be determined conclusively at birth because features that are normally associated with female or male are present in an unusual combination. These features can include a variety of morphological, hormonal, genetic variations which fall outside the norms.
Intersexuality differs from but is related to androgyny, although some Intersex people do identify as androgynous.
According to the Intersex Society of North America, several conditions "sometimes involve intersex anatomy." 
5-alpha reductase deficiency
Androgen Insensitivity Syndrome (AIS)
Partial Androgen Insensitivity Syndrome (PAIS)
Clitoromegaly (large clitoris)
Congenital Adrenal Hyperplasia (CAH)
Gonadal Dysgenesis (partial & complete)
Sex Chromosome Mosaicism
MRKH (Mullerian agenesis; vaginal agenesis; congenital absence of vagina)
Ovo-testes (formerly called "true hermaphroditism")
Progestin Induced Virilization
- ↑ [http://www.isna.org/faq/conditions "Intersex conditions" ISNA. Intersex Society of North America, Web. 24 Apr. 2011.