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Mosaicism is a condition in which cells within the same person have a different genetic makeup. It is caused by an error in cell division that occurs very early in the development of the unborn baby.

Review Date 10/13/2022

Updated by: Anna C. Edens Hurst, MD, MS, Associate Professor in Medical Genetics, The University of Alabama at Birmingham, Birmingham, AL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.