Description:

First morphologically recognizable cell of lymphocytic lineage, round in shape. Under normal conditions it exists in secondary lymphoid folliculi.

Size:

15-25 µm.

Cytoplasm:

Homogenous, basophilic, with the color a little bit more intensive at the margins; no granules.

Nucleus:

Round or slightly oval; it has a fine dispersed chromatin which is coarser than in the myeloblast. High nucleocytoplasmatic ratio (5:1 to 7:1).

Nucleoli:

Only one or two blue colored nucleoli are present.