Prompt Cast
The Fascinating Patterns of Blaschko's Lines in Humans
TLDR Blaschko's Lines are unique patterns found on the skin, teeth, eyes, and tongue of humans, and are evidence of the migratory route that our skin cells took while developing in the womb. These lines are visible under UV light and reveal the genetic mosaicism of humans, where even genetically identical cells have slight differences due to environmental factors.
Timestamped Summary
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Humans are a striped species of animal known as brindle-coated animals.
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Blaschko's Lines are the stripes that all humans have, named after dermatologist Alfred Blaschko, and while they were initially thought to follow predefined patterns on humans, they are actually their own distinct thing and not related to blood vessels or nerve endings.
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Blaschko's Lines are evidence of the migratory route that our skin cells took and settled into while we were developing in the womb, and they are the molecular evidence of the swirls created as skin cells expanded and stretched to cover a growing body.
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Blaschko's Lines are visible under UV light because the cells that make up our skin are almost identical but have slightly different genetic instructions, making humans genetic mosaics.
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Mosaicism is universal, meaning that even genetically identical cells within the same person have slight differences due to environmental factors.
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Blaschko's lines can be found on various parts of the body, including the scalp, and they are not limited to the skin.
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Blaschko's lines can also be found in teeth, eyes, and tongue, and conditions like vitiligo can reveal these lines in regular light without UV light.
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