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. 2019 Jul 4;366(12):fnz148. doi: 10.1093/femsle/fnz148

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© The Author(s) 2019. Published by Oxford University Press on behalf of FEMS.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Paramecium bursaria and Chlorella endosymbiosis. A. Z-stack of confocal sections of the chlorophyll autofluorescence of Chlorella endosymbionts within one Paramecium bursaria cell. With colour representing the intensity of fluorescence and therefore the position of the Chlorella in the Z-plane. B. Diagram of the relationship, showing the nutrient exchange with the transfer of maltose from the Chlorella in exchange for organic nitrogen (denoted as ‘N’ as the identity of this compound is currently unknown). Ma = macronucleus; Mi = micronucleus.