Could two pieces of a stone mosaic ever be identical? Of course, the answer is no--and each stone’s variation subtly contributes value to the finished work. Why should your cells be any different?

(A) Hypothetical pedigree of Segmental neurofibromitosis type 1, and (below) molecular analysis showing somatic mosaicism. The three-generation pedigree illustrates the occurrence of a sporadic ...

Medically reviewed by Brigid Dwyer, MD Mosaic Down syndrome is a variant of Down syndrome. Down syndrome is a congenital (present at birth) genetic condition that occurs when a person has three copies ...