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Serum samples from all 23 extant crocodilian species were tested for phospholipase A 2 (PLA 2 ) activity against nine different bacterial species. The data were used to generate a PLA 2 activity profile for each crocodilian species, and the data were used to compare the activities of the three main lineages (Alligatoridae, Crocodylidae, and Gavialidae), the seven different genera, and to compare all of the 23 individual species. The data revealed that the three lineages of crocodilians (Alligatoridae, Crocodylidae, and Gavialidae) exhibited PLA 2 activities toward nine species of bacteria that were statistically distinguishable. In addition, the PLA 2 activities of crocodilians in a specific genus tended to be more similar to other members in their genus than to members of other crocodilian genera.