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. 2014 Jan 17;9(1):e79575. doi: 10.1371/journal.pone.0079575

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© 2014 Feng et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Sample were negatively stained with 2% uranyl acete and observed by electron microscopy. A, Analysis of the particles formed in recombinant baculovirus infected silkworm pupae. B, Particles collected from sucrose gradients (purified VLP). Magnification 40,000×.