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Pseudocolor images of the pH distribution in L. patella under an incident photon irradiance of 250 μmol photons m−2 s−1 and after darkening. Times in light and after darkening are indicated in minutes in each panel. The monochrome image (lowermost right panel) is the cross-section illuminated with red light showing the Prochloron layer and the biofilm underneath the ascidian. Regions of interest (ROI) are outline din blue and show the origin of data plotted in Figure 8.
