In the mosaic form, only some of the body's cells have the third X chromosome.

CNN: Triple X syndrome

Because only some cells contain the extra X chromosome, females with the mosaic form of triple X syndrome may have less severe symptoms.

CNN: Triple X syndrome

In Syndrome X, the body overproduces insulin because the cells refuse to listen to its instructions.

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In my lab days, I always wondered about the wisdom of using nonoxynol-9 as a spermatocide because we used to use a related compound, octoxynol-9 (better known to labbies as Triton X-100), to break open human epithelial cancer cells to examine the proteins inside them.

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