Does anyone know the differences between primary and secondary follicles in lymphoid organs?

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Is it differed because primary follicles have no germinal center and secondary follicles do have germinal center??? Thanks
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in primary follicle only small amount of B cells and large no. of dentritic cells will be there. after some antigenic challenge, it became secondary follicle, thus no. of B cell cell be increased, no. of concentric B cells forming a germinal center, with some T lymphocytes, and macrophages.
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