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The samples helped people discover entirely new family trees and could reveal consequential health information, like a genetic predisposition to cancer.

My default predisposition is to find silver linings, not overreact and stay calm while others are screaming.

Dr Raffan explained: "It alters the predisposition to weight gain because it's tweaking a system that is involved in regulating how hungry we feel and how much energy we burn off."

There is an ongoing study of genetic predisposition to depression and addiction.

This sensitivity is in part due to a genetic predisposition estimated to exist in up to 50% of the population that determines whether people metabolize caffeine faster or slower.