Abstract
In rat liver, six bands of esterase activity with β-naphthyl acetate were detected by electrophoresis on the cellulose acetate membrane. By comparing the esterase zymograms from adult liver, lymph nodes, spleen, intestinal mucosa, and hepatocyte fraction, it is apparent that Bands 3 and 6 are derived from hepatocytes, while Bands 2, 4, and 5 are mainly localized in hepatic reticuloendothelial cells. Band 1 was obscure in adult liver. During the development of rat liver, Band 1 was detectable from the prenatal upto the 2 weeks postnatal liver and then it disappeared after an increase in the intensity of Band 3. Band 6 appeared 2 weeks after birth showing a higher activity than in adult.
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