<Li> "marginal zone" bordering on white pulp </Li> <Tr> <Td> white pulp </Td> <Td> Active immune response through humoral and cell - mediated pathways . </Td> <Td> Composed of nodules, called Malpighian corpuscles . These are composed of: <Ul> <Li> "lymphoid follicles" (or "follicles"), rich in B - lymphocytes </Li> <Li> "periarteriolar lymphoid sheaths" (PALS), rich in T - lymphocytes </Li> </Ul> </Td> </Tr> <Ul> <Li> "lymphoid follicles" (or "follicles"), rich in B - lymphocytes </Li> <Li> "periarteriolar lymphoid sheaths" (PALS), rich in T - lymphocytes </Li> </Ul> <Li> "lymphoid follicles" (or "follicles"), rich in B - lymphocytes </Li>

The site of blood cell formation is referred to as which of the following