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SUMMARY: Electron micrographs of thin sections of the wall of a Cylindrospermum sp. treated with lysozyme show that layer 2 (intermediate layer) of the wall is removed. Hence this layer is composed of mucopolymer. This observation, and the previous reports that this layer is thickened in mature spores of a Cylindrospermum sp. and in vegetative cells of Oscillatoria princeps, suggest that mucopolymer determines wall strength and maintains cell shape.
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