1. Department Zoology and Animal Cell Biology, Faculty of Science and Technology, Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), CBET Research Group, University of the Basque Country, Leioa, Spain;
2. European Commission – Joint Research Centre, Institute of Health and Consumer Protection, NSB Unit, Ispra, Italy;
3. Centre for Ultrastructural Imaging, King’s College London, London, UK