Enzyme activity measurements performed on lymphocytes (laboratory of Genetic Metabolic Diseases, Amsterdam UMC, the Netherlands [www.labgmd.nl]) revealed reduced long‐chain acyl‐CoA dehydrogenase (LCHAD) activity and markedly reduced long‐chain 3‐ketoacyl‐CoA thiolase activity (Table 1). The gene discussed is HADHA; the disease is metabolic disease.