Transmission electron micrographs (TEM) showing the ultrastructure of putative primary endosymbionts in n

gen. et sp. Low magnification TEM showing four putative endosymbionts, each surrounded by sac-like vesicles (sc) defined by an outer membrane (Bar = 2 μm). High magnification TEM showing two enveloping inner membranes (arrowheads) and thylakoids (arrows) that are continuous with the innermost enveloping membrane (Bar = 0.2 μm). TEM showing the thylakoids, the sac-like vesicle (sc), and a cleavage furrow indicative of division (arrowheads) (Bar = 0.5 μm). High magnification TEM showing the central core of an endosymbiont containing viral particles (arrowheads) (Bar = 0.5 μm). High magnification TEM showing a pronounced invagination of the innermost enveloping membrane (arrowhead) (Bar = 0.5 μm). High magnification TEM showing the membrane (arrowheads) that defines the sac-like vesicle (sc) and the two innermost enveloping membranes (double arrowheads) (Bar = 0.2 μm). TEM showing viral particles (arrowhead) consisting of a polygonal head and tail, and positioned within the core of an endosymbiont (Bar = 0.5 μm). An inset showing a complete tailed viral particle (Bar = 0.2 μm).<p><b>Copyright information:</b></p><p>Taken from "Morphology and molecular phylogeny of a marine interstitial tetraflagellate with putative endosymbionts: n. gen. et sp. (Cercozoa)"</p><p>http://www.biomedcentral.com/1471-2180/8/123</p><p>BMC Microbiology 2008;8():123-123.</p><p>Published online 22 Jul 2008</p><p>PMCID:PMC2500021.</p><p>