Fluorescence camera images of S. pistillata adults from the shallow reef (A-C) and from the mesophotic reef (D-F). Green fluorescence indicates GFPs fluorescence (B, E), red fluorescence indicates the chlorophyll fluorescence of Symbiodinium (C, F), overlap of the 2 channels (A, D). Blue rectangular inserts represent a 4x magnification of the relative image (B, C, E, F).