- Loss of mammalian Sprouty2 leads to enteric neuronal hyperplasia and esophageal achalasia. Taketomi, T., Yoshiga, D., Taniguchi, K., Kobayashi, T., Nonami, A., Kato, R., Sasaki, M., Sasaki, A., Ishibashi, H., Moriyama, M., Nakamura, K., Nishimura, J., Yoshimura, A. Nat. Neurosci. (2005)