<p>Spleens were dissected from 129/Sv×C57BL/6 mice 30 days after i.p. inoculation with 1% (w/v) RML I6200. MACS-isolated B lymphocytes were cultured under passive leakage (A) and basal (B) conditions essentially as described in <a href="http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002538#ppat-1002538-t004" target="_blank">Table 4</a> and tissue culture supernatants were isolated by sequential centrifugation (<a href="http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002538#s4" target="_blank">Materials and Methods</a>). After centrifugation at 100,000× g for 2 h pellets were resuspended in PBS, absorbed onto carbon-coated grids and negatively stained with 1% uranyl acetate. Cup-shaped exosome-like membrane particles of different sizes (see arrows) are shown in <a href="http://www.plospathogens.org/article/info:doi/10.1371/journal.ppat.1002538#ppat-1002538-g001" target="_blank">Figure 1B</a>. Twenty randomly recorded images (surface area: 2.82 µm<sup>2</sup>) from each condition were counted and the number of exosome-like particles (1.7±1.2 (A) and 22.8±6.5 (B) per surface area, p≪0.001) determined in a blinded manner. Scale bar: 0.2 µm.</p

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