(A) Nissl granules are granular bodies found in the cell body $(cyton)$ and dendrites of a neuron. They are composed of rough endoplasmic reticulum $(

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(A) Nissl granules are granular bodies found in the cell body $(cyton)$ and dendrites of a neuron. They are composed of rough endoplasmic reticulum $(RER)$ and free ribosomes, which are involved in protein synthesis. These granules are characteristically absent in the axon and the axon hillock, which is the region where the axon originates from the cell body.