in taxon Homo sapiens white pulp of spleen spleen marginal sinus EMAPA:37964 The border region surrounding the spleen B cell follicles and the periarteriolar lymphoid sheath that separates it from the marginal zone that mediates lymphocyte entry into the white pulp from the blood. UMLS:C1710157 splenic marginal sinus Note that there is no consensus in the literature about which compartments constitute the white pulp or the ramifications of the microvasculature. In addition, notable differences exist between humans and rodents. In this ontology, the marginal sinus (which may not exist in human) has been included as part of the white pulp. The perifollicular zone, which is present in human and not rodents, may be the functional equivalent of the marginal sinus in rodents. UBERON:0010398 NCIT:C49776 MA:0000754