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This work was supported by the “Fond zur Förderung der wissenschaftlichen Forschung” project no. 3320. I am indebted Dr. V. Vacquier for editing the manuscript.
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Czihak, G., Czihak, I. Positively charged macromolecules prevent fertilization of sea urchin eggs. Naturwissenschaften 68, 144–145 (1981). https://doi.org/10.1007/BF01047259
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DOI: https://doi.org/10.1007/BF01047259