NanoSIMS (nano-scale Secondary Ion Mass Spectrometer) image representing a cross-section (250 µm in diameter) of a sea anemone tentacle and depicting its cell-specific uptake of nitrogen

from blue (no uptake) to purple (maximum uptake). Unicellular dinoflagellates endosymbionts (family Symbiodiniaceae) are found in the inner cell layer of the tentacle and can easily be

identified by their purple colour (high nitrogen uptake). Article: Down to the bone: the role of overlooked endolithic microbiomes in reef coral health. ISME J 14, 325–334 (2020).

https://doi.org/10.1038/s41396-019-0548-z Authors: Jean-Baptiste Raina, Nils Rädecker, Maha Cziesielski, Manuel Aranda, Mathieu Pernice, Paul Guagliardo, Jeremy Bougoure, Christian Voolstra