See tracker about spleen terms first, and then these suggested changes should make sense.

1. Add lymphoid follicle part_of cortex of lymph node (UBERON:0002006)
2. lymphoid follicle should have the is_a child lymph node B follicle.
3. lymph node B follicle should have the is_a children primary lymph node B follicle and secondary lymph node follicle, similar to the children of spleen B cell follicle
4. Add lymph node germinal center term, make it an is_a type of secondary nodular lymphoid tissue (UBERON:0001745), part_of secondary lymph node B cell follicle .
5. add the terms "lymph node B cell corona", and make its is_a parent "B cell corona".