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Holstein, Thomas W. and Mala, Carola and Kurz, Eva and Bauer, Karin and Greber, Martin and David, Charles N. (1992): The primitive metazoan Hydra expresses antistasin, a serine protease inhibitor of vertebrate blood coagulation. cDNA cloning, cellular localisation and developmental regulation. In: FEBS Letters, Vol. 309, No. 3: pp. 288-292

Greber, Martin and David, Charles N. and Holstein, Thomas W. (1992): A quantitative method for separation of living hydra cells. In: Development Genes and Evolution, Vol. 201, No. 5: pp. 296-300