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. 2022 Nov 23;47(6):fuac046. doi: 10.1093/femsre/fuac046

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© The Author(s) 2022. Published by Oxford University Press on behalf of FEMS.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 7. — Predicated features of euphotic marine NCD communities are likely influenced by habitats. Potential strategies used by NCDs to acquire energy and C needed to support N₂ fixation with energetic constraints and O₂ inactivation of nitrogenase. Question marks emphasize where many open questions remain. Notably, there is recent evidence that NCDs may be fixing N₂ on particles, as discussed in this review (Geisler et al. 2019). EPS—extracellular polymeric substances. Created with BioRender.com.