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. 2016 Jul 6;6:29474. doi: 10.1038/srep29474

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(A) Controls (B) stressed treatments -(A1&B1) 3 μm filters; (A2&B2) 0.45 μm filters (A3&B3) 0.2 μm filters. Arrow: nucleus of a sponge cell. Bar: 20 μm.