<prompt> Nissl substance is found in: March 2013NeuronHepatocytesCardiocytesENterocytes  <response>: Ans. A i.e. Neuron Nissl bodyNissl or tigroid substance It is a large granular body found in neurons. These granules are rough endoplasmic reticulum RER with rosettes of free ribosomes, and are the site of protein synthesis. It was named after Franz Nissl, a German neurologist who invented the Nissl staining method 