Combined Oxidative Phosphorylation Deficiency 9, also known as coxpd9, is related to cardiomyopathy, familial hypertrophic, 1 and combined oxidative phosphorylation deficiency, and has symptoms including dyspnea An important gene associated with Combined Oxidative Phosphorylation Deficiency 9 is MRPL3 (Mitochondrial Ribosomal Protein L3), and among its related pathways/superpathways are Metabolism of proteins and Peptide chain elongation. Affiliated tissues include liver, and related phenotypes are global developmental delay and hepatic steatosis