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This field shows a growing cartilage plate from the trachea of a young rat.
The purple colour or metachromatic colour of the cartilage matrix is due to the presence of acidic glycoproteins or glycosaminoglycans.
At the growing extremity of the cartilage plate (below), some chondroblasts are at various stages of differentiation into chondrocytes. These are seen in the developing lacunae embedded in a thin, lightly stained matrix poor in acidic glycoproteins.
Stain: Toluidine blue
Magnification: ×1000
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