A look at third (sometimes called supernumerary) nipples, a relatively common condition where an individual has an extra nipple. Included here are details about causes, diagnosis, and treatment.

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Some animals have deactivated genes which code for extra appendages. Do humans have any genetic code which is 'switched off' and would lead to different morphology? - Quora

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Some animals have deactivated genes which code for extra appendages. Do humans have any genetic code which is 'switched off' and would lead to different morphology? - Quora