Combined Oxidative Phosphorylation Deficiency 14, also known as coxpd14, is related to mitochondrial dna depletion syndrome 4a and combined oxidative phosphorylation deficiency, and has symptoms including myoclonus An important gene associated with Combined Oxidative Phosphorylation Deficiency 14 is FARS2 (Phenylalanyl-TRNA Synthetase 2, Mitochondrial). Affiliated tissues include brain and bone marrow, and related phenotypes are hearing impairment and visual impairment