part of part of Homo sapiens lymphoid tissue lymph node germinal center lymph node germinal center light zone UBERON:8410052 light zone of germinal center light zone of lymph node germinal center Lymph node germinal centers contain two microenvironments: the light zone and the dark zone. The light zone is sparsely populated with B cells and includes additional cell types such as follicular dendritic cells, lymph node tingible macrophages and T follicular helper cells. germinal center light zone