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Effect of switching food sources on light vs. dark growth. Ciliates cultured on Rhodomonas lens (RHODO, top panel) were transferred to RHODO, PLY, or an equal mixture of the two. Ciliates cultured on Tetraselmis chui (PLY, bottom panel) were likewise transferred to the PLY, RHODO, or a mixture. Means with standard deviations of triplicates. Significant differences between light and dark treatments indicated by * and ** for P < 0.05 and 0.01 (t-test), respectively.
