The brick red-staining secretory granules of an eosinophil contain:
a. Histamine and heparin
b. Immunoglobulin
c. Major basic protein
d. Serotonin
e. Tumor necrosis factor
ANS: C
The positively charged major basic protein of eosinophils avidly binds acid stains like eosin and accounts for the red color of eosinophil cytoplasm.
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