The cytoplasmic granules of mast cells stain intensely with toluidine blue. This is because of the contents of these granules, which contain:
a. Acid hydrolyases
b. Histamine and proteoglycans
c. Lipid
d. Matrix granules
e. Ribosomes
ANS: B
The negatively charged proteoglycans of mast cells avidly bind toluidine blue.
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