- Enhanced glucose-dependent insulinotropic polypeptide secretion and insulinotropic action in glucagon-like peptide 1 receptor -/- mice. Pederson, R.A., Satkunarajah, M., McIntosh, C.H., Scrocchi, L.A., Flamez, D., Schuit, F., Drucker, D.J., Wheeler, M.B. Diabetes (1998)