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(A) Plot of the percent usage of each of the 20 common amino acids in Tribolium castaneum 2 vs. that in Tribolium castaneum 1; the correlation coefficient (ruse) was 0.975 (P < 0.001). (B) Plot of ruse vs. proportion of amino acid difference pairs of paralogous vitellogenins from 10 insect species; the point for Periplaneta americana is indicated.
