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. 2010 Sep 23;6(9):e1001009. doi: 10.1371/journal.ppat.1001009

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Clusters of P. murina from a homogenate of an infected mouse lung were dropped on glass slides and stained with a rapid Wright-Giemsa. The black arrow points to a cluster of trophic forms. The white arrow indicates a mature cyst. The yellow arrow indicates an immature cyst with only three nuclei present in this section. The magnification bar represents 10 um. The micrograph was taken with an Olympus BH2 microscope and DP-72 digital camera.