Neuroblastoma cells show vesicles resembling the normal presynaptic terminals; however, the vesicles in neuroblastoma are larger and more irregular. This electron micrograph shows at least two such synaptic endings containing numerous dense core neurosecretory granules. Courtesy of: Dr. Luciano de Souza Queiroz, Dept. of Pathology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Campinas, São Paulo State, BRAZIL. Additional images are here.