toluidine blue O
a blue basic dye, used as an antibacterial agent, as a nuclear stain, and to stain metachromatically certain structures (the granules in mast cells; cartilage matrix that is rich in chondroitin sulfate), and in electrophoresis to stain RNA, RNase, and mucopolysaccharides; it also antagonizes the anticoagulant action of heparin.
See Also: tolonium chloride
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Examples: glitazone, GI cocktail, etc.