Blaschko's lines

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Notion

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Science and technology

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What Wikipedia says

Blaschko's lines, also called the lines of Blaschko, are lines of normal cell development in the skin. These lines are only visible in those with a mosaic skin condition or in chimeras where different cell lines contain different genes.

Excerpt from the Wikipedia article “Blaschko's lines”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: see above, CC BY 2.0, via Wikimedia Commons.