Substance P enhances desensitization of the nicotinic response in bovine chromaffin cells but enhances secretion upon removal.
Lyford LK, Kent-Braun JA, Westhead EW. Substance P enhances desensitization of the nicotinic response in bovine chromaffin cells but enhances secretion upon removal. J Neurochem. 1990 Dec; 55(6):1960-5.