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}}</ref> In humans and other mammals, it develops from an outgrowth in the embryo called the genital tubercle. Initially undifferentiated, the tubercle develops into either a [[penis]] or a clitoris during the development of the reproductive system depending on exposure to androgens (which are primarily male hormones). The clitoris is a complex structure, and its size and sensitivity can vary. The glans (head) of the human clitoris is roughly the size and shape of a pea and is estimated to have about 8,000 sensory nerve endings.<ref name=WP/><ref name="Caroll2012"/>

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