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Chitinase activity in Prochlorococcus and Synechococcus. Endochitinase activity in Synechococcus WH7803 (A), Prochlorococcus MIT9303 (B), and Prochlorococcus MIT9313 (C) measured in spent media and cell lysates. Strains with the complete chitin degradation pathway display such activity in the spent media. Activity is lost after boiling. *P < 0.05, ***P < 0.001. Exochitinase activity is shown in SI Appendix, Fig. S1.
