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An alginate produced by the fermentation of Azotobacter vinelandii or Pseudomonas mendocina. The chemical structure consists of blocks of polymannuronic acid (poly M), polyguluronic acid (poly G) and alternating blocks of the two uronic acids (poly MG). Unlike the alginate from seaweed, this polysaccharide is acetylated. Samples of this material have not been treated to remove bacterial cells.