Pyridinium Compounds 10 article 10 Fluorescent Dyes 6 controlled study 6 nonhuman 6 pyridinium derivative 6 unclassified drug 6 Amines 4 Animals 4 Calcium 4 Calcium signal 4 Cholinergic Agonists 4 Chromaffin Cells 4 Dansyl Compounds 4 Endocytosis 4 Endosomes 4 Exocytosis 4 FM1-43 4 Horseradish Peroxidase 4 Hydrazines 4 Membrane Fusion 4 Mice 4 Nitriles 4 Potassium 4 Protein Kinase Inhibitors 4 Quaternary Ammonium Compounds 4 Time Factors 4 animal cell 4 chemistry 4 chromaffin cell 4