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Evolutionary biases and prejudices
The current developmental phenomena of supernumerary nipples and breast lines in humans reflect their shared evolutionary origin with other mammals. Embryonic and molecular studies show that humans inherit ancient developmental programs that control the formation of mammary glands. These glands form along the mammary line early in fetal development, with the possibility of remnants remaining as additional nipples. This phenomenon is not a deformity but rather evidence of the evolutionary connection between humans and other mammals, utilizing the same ancient embryonic mechanisms that have evolved over millions of years.
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