IN VIVO FUNCTION OF SUBCELLULAR PARTK.I.KS 







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Fig. 14. Acid phosphatase activity in frozen section of kidney from male rat. Tissue fixed in 

 cold formol-calcium and incubated for 30 min. at 37°C, in medium of Gomori (16). Note, in 

 proximal tubule, numerous droplets with high acid phosphatase activity. In distal tubules {upper 

 left) droplets are fewer and smaller. X 550- 



Fig. 15. Acid phosphatase activity in rat liver. Tissue treated as in fig. 14. Note peribiliary 

 bodies with high acid phosphatase activity. .Xrrow points to Kupffer cell with intense aci<l 

 phosphatase activity. X 450- 



Fig. 16. Acid phosphatase activity in liver of rat fed 3'methyl, 4 dimethylaminoazobenzcne 

 for 3 weeks. Ti.ssue treated as in fig. 14. Some areas show normal peribiliary granules clearly. 

 Particularly in lower part of the photograph, there are a great many Kupffer cells with very 

 high acid phosphatase activity. X 95- 



