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Luminescence intensity image showing internal tissue structure of the coral Goniastrea sp. indicating 2 ROI’s where photosynthesis was activated (left). Pseudocolor images of the distribution of the O2 in the two ROIs immediately after activation and during a subsequent dark phase. A red laser pointer (λmax 660 nm) was used for the local activation of photosynthesis with a photon irradiance of 350 μmol photons m–2 s–1, while the rest of the coral sample was in darkness.
