2006; Homma et al. 2011) would impair glycogenolysis and glucogenesis. Furthermore, BH4 deficiency would reduce neuronal NOS (nNOS) activity, and the mice could not take in a sufficient amount of food, similar to the pyloric stenosis‐like symptoms reported in nNOS−/− mice (Huang et al. 1993). The gene discussed is NOS1; the disease is pyloric stenosis.