What cells may demonstrate a coarse block pattern of activity with the PAS stain?
a. Normal lymphocytes
b. mature neutrophils
c. Normal erythroid precursors
d. Malignant lymphoblasts
ANS: D
Malignant lymphoblasts may demonstrate a coarse block pattern of activity with the PAS stain. Normal lymphocytes and erythroid precursors are negative. Mature neutrophils demonstrate diffuse positive activity.
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