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Most examples of positive selection inferred from nucleotide sequence data involve host-pathogen interactions. However, positive selection also promotes the divergence of proteins mediating spermegg recognition in marine invertebrates. The abalone spermatozoon has a large acrosomal vesicle containing two proteins of 16 kDa and 18 kDa. Lysin, the 16-kDa protein, exhibits species-specificity in dissolving...
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