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Two common types of cells involved in cartilage growth; the undifferentiated perichondrial cells and chondrocytes. The perichondrial cells provide new external layers of cartilage matrix and are responsible for appositional growth. Chondrocytes proliferate to produce chondrogenic cells which generate a new interstitial cartilage matrix (interstitial cartilage growth). We previously described a third type of cartilage growth which is a mesenchymal cell-dependent type in the cartilage of the air breathing dendritic organ of catfish. The current study aimed to investigate this phenomenon using histochemical techniques, semi-thin sectioning, TEM and immunohistochemical staining. Typical mesenchymal cells penetrated the cartilage of the air breathing organ......Read more