Successful Demonstration of an Elusive Cell Coat in Amebae*

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Abstract
Cell coats were cytochemically demonstrated for the 1st time in myxamebae of Fuligo septica, Didymium iridis, Dictyostelium discoideum, Cavostelium apophysatum and amoebae of Naegleria gruberi. The stain enhances the cell coats of Physarum polycephalum plasmodia, Ceratiomyxa fruticulosa myxamebae and Acanthamoeba sp. Cell coats usually unstained by cationic dyes stain intensely with the aid of the new cytochemical protocol utilizing 0.5% Alcian blue in the primary fixative and 0.05% ruthenium red in the secondary fixative.