Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: May 5th, 2025

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The cortical nodule (follicle) of the lymph node is a closely-packed grouping of lymphocytes. The lymph follicles change in number, arrangement, and size depending upon the condition of the lymph node - for example, they grow larger or increase in number when exposed to an unknown antigen.

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