Abstract
The fine structural localization of aryl sulfatase activity in the epiphyseal cartilage of the young guinea pig was investigated, using p -nitrocatechol sulfate as substrate and lead as capturing ion. Intracellularly, the enzyme reaction product was found in cytoplasmic dense bodies and portions of the Golgi complex. Extracellularly, aryl sulfatase activity was exclusively located in matrix vesicles type I. These histochemical findings strongly support the concept of the lysosomal nature of cytoplasmic dense bodies and matrix vesicles type I in the epiphyseal pate.
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