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Sperm chemotaxis activity. Diffusible proteins from X. laevis egg jelly exhibit sperm chemoattractant activity. Sperm passage through a porous filter in a two-chamber assay was increased 5-fold over controls by the presence of soluble whole-egg jelly (SWEJ; 60 μg) or diffusible protein extract (12HEW; 30 μg), but not by “structural” (60 μg) egg jelly proteoglycans.
