As a person with chimerism develops, his or her body may undergo unique changes. For example, her liver may consist of cells with one set of chromosomes, while her kidney carries an entirely different set. Some individuals with chimerism develop distinctive Blaschko’s lines under the skin. These lines are generally invisible but become visible under a certain spectrum of UV light. In some people with chimerism, these lines form an arrow that points downwards from the shoulders.

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