Identify the ganglion cell nucleolus. Nucleoli are especially prominent in cells active in protein synthesis. Nucleoli also stain basophilically. Because this is a smear, we are looking at the whole cell, not a section through it. Now pay attention to the neutrophil.
Neutrophils are the end stage of a differentiated cell line.
Their nuclei are lobulated, a sign of maturity in these cells, and heterochromatic. Note that even in a thin section like this the nucleus is heterochromatic. Identify the lymphocyte. Note that in contrast to thicker paraffin sections, in this much thinner plastic section parts of the lymphocyte nucleus no longer appear totally heterochromatic. Identify the erythrocytes, and notice that they lack a nucleus altogether.