Final answer:
The deep cortical zone (DC), or paracortex, is mainly composed of lymphoid tissue. It is found in the thymus and lymph nodes and is responsible for immune responses.
Step-by-step explanation:
The deep cortical zone (DC), or paracortex, is mainly composed of lymphoid tissue. In the context of the thymus, the cortex contains large numbers of thymocytes, epithelial cells, macrophages, and dendritic cells. It is densely packed and stains more intensely than the rest of the thymus.
The deep cortical zone or paracortex is also found in the lymph nodes and is responsible for immune responses.