FD/MAS is not hereditary. We did not get FD/MAS from our parents, and we cannot pass it on to our children. FD/MAS is caused by a mutation during a baby’s development while still in the uterus. FD/MAS is a genetic disease because the mutation happens before birth. If the mutation occurs early in development, many tissues may be affected. If it occurs late in development, fewer tissues may be affected.
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