- Intestinal distribution of human Na+/H+ exchanger isoforms NHE-1, NHE-2, and NHE-3 mRNA. Dudeja, P.K., Rao, D.D., Syed, I., Joshi, V., Dahdal, R.Y., Gardner, C., Risk, M.C., Schmidt, L., Bavishi, D., Kim, K.E., Harig, J.M., Goldstein, J.L., Layden, T.J., Ramaswamy, K. Am. J. Physiol. (1996)