S containing healthy dinoflagellates remained free of either marker. Studies of the anemone A. pulchella have generated further evidence, by tracking the location of Rab GTPases, that phagosomal maturation and endosomal trafficking (described in Appendix 1) are altered by the presence of Symbiodinium cells in phagosomes (see Appendix 1). First, cnidarian orthologs to human Rab5 and -7 were sequenc