human_reference_atlas Homo sapiens germinal center tonsil germinal center consider adding related terms, e.g. secondary lymphoid tissue of tonsil tonsil germinal center CALOHA:TS-1288 tonsil germinal center uberon AS A germinal center that is part of a tonsil. tonsil reaction center UBERON:0013688 The germinal center or reaction center is the activated center of a lymphoid follicle in secondary lymphoid tissue where B-lymphocytes are stimulated by antigens and helper T cells (T-lymphocytes, helper-inducer) are stimulated to generate memory cells. Here, the germinal center of a tonsil[TS-1288].