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Effect of stirring during fixation upon immunofluorescence. Results with distribution of albumin-producing cells in liver.

When the immunofluroscent study on the distribution and the incidence of albumin-producing hepatocytes in the rat liver was performed by the method of Sainte-Marie, the number of positive cells showed various values (10-60%). It was surmised that when the permeability of the fixative was delayed, albumin had flowed out from the cytoplasm of the unfixed hepatocytes. By the simple means of constant stirring of the fixative using a magnetic stirrer, we accomplished rapid fixation and achieved results in which positive cells attained 100%. On the other hand, the incidence of positive cells decreased markedly when rats were fed a protein-free diet.