Cavalier-Smith T. Principles of protein and lipid targeting in secondary symbiogenesis: euglenoid, dinoflagellate, and sporozoan plastid origins and the eukaryote family tree. J Eukaryot Microbiol. 1999 Jul-Aug;46(4):347-66. PUBMED
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High mag SEM of the canal opening and pellicle strips of Monomorphina (photosynthetic euglenid)