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Adj.1.nonheritable - not inheritable
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In the study, 58 percent of the variation measured in immune system responses was almost completely determined by nonheritable factors, such as exposure to microbes.
Examining differences in the levels and activity states of these components within pairs of monozygotic and dizygotic twins, the Stanford scientists found that in three-quarters of the measurements, nonheritable influences -- such as previous microbial or toxic exposures, vaccinations, diet and dental hygiene -- trumped heritable ones when it came to accounting for differences within a pair of twins.
There are other nonheritable congenital bony conditions that arise from the sinuses or affect them as a result of their anatomic location.