(NANA and NAGA, Fig. 1A), neurotransmitters and neurotransmitter-like compounds (artherenol, carbachol and glutamate, Fig. 1B), aminoacids (cysteine, glycine and arginine, Fig. 1C) and proteins (albumin and mucin, Fig. 1D) on discharge. 2% v/v lidocaine as well was effective in inhibiting discharge (data not shown).