"To have the mutation" means that a person's genes have a change or alteration from the usual one. This change can lead to differences in their characteristics, behavior, or health compared to others. Full definition
The research team identified 99 families that had the inherited form of the disease, but did not have mutations in one of the previously identified genes. (sciencedaily.com)
In fact, individuals who have mutations in the gene coding for this protein have significantly more muscle mass and enhanced strength. (holtorfmed.com)
How are individuals who learn they do not have the mutation affected by that knowledge? (bookbrowse.com)