Personality traits are consistently associated with blood mitochondrial DNA copy number estimated from genome sequences in two genetic cohort studies. - Oppong RF; Terracciano A; Picard M; Qian Y; Butler TJ; Tanaka T; Moore AZ; Simonsick EM; Opsahl-Ong K; Coletta C; Sutin AR; Gorospe M; et al. (ELife, 2022)