- Reduced endothelin converting enzyme-1 and endothelin-3 mRNA in the developing bowel of male mice may increase expressivity and penetrance of Hirschsprung disease-like distal intestinal aganglionosis. Vohra, B.P., Planer, W., Armon, J., Fu, M., Jain, S., Heuckeroth, R.O. Dev. Dyn. (2007)