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Previous studies on the changes in both the activity and localization of acid hydrolases in tails of Xenopus larvae during growth and metamorphosis have led to the conclusion that the increase in activity of cathepsins and acid phosphatase in the regressing tissue reflects the synthesis of acid hydrolases by activated macrophages, rather than the release of such enzymes from preformed lysosomes in the regressing tissue itself (13, 14). In order to elucidate the mechanism that could account for the progressive stimulation of phagocytic activity, it appeared of relevance to follow the regressive changes in the fine structure of the tadpole tail. This study was also promoted by the recognition of the fact that, in spite of a voluminous literature on the histological aspect of tail regression, a number of important problems have remained unsolved. In fact, there exist divergent views, e.g. on the relative importance of autolysis and phagocytosis, or on the origin of macrophages in the regressing tadpole tail (2). The present report, based on a very extended electron microscope study, is chiefly concerned with some conspicuous early changes in the fine

ULTRASTRUCTURAL CHANGES IN REGRESSING TAIL MUSCLES OF XENOPUS LARVAE AT METAMORPHOSIS