(Science: biochemistry) molecule of around 30 kd normally sequestered in the acrosomal vesicle of a sea urchin spermatozoon and that through its specific lectin like binding to the vitelline membrane of the egg confers species specificity in fertilization.
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... not the rule. Also note that there are many barriers to this kind of reproduction, pre- and post-zygotic. For example, it is possible that bindin-like proteins on the sperm of one organism do not match the receptors on the egg of another, so the sperm cannot get inside the egg
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