we conclude that ( 1 ) some cells in the developing brain selectively endocytose and accumulate blood-borne horseradish peroxidase in their cytoplasm , ( 2 ) these cells do not appear to be neurons but a particular cell type associated to the mononuclear phagocytic system and ( 3 ) they cluster transiently in particular sectors of the cortical and subcortical white matter during the first 2 weeks after birth .
C0010834
cytoplasm
C0007634
cell type