Acknowledgement
The authors thank O. Gavrilova for long-term collaboration, S. Smirnova for a supply of plankton samples, and N. Velichko for a help with transmission electron microscope. We thank St. Petersburg University Research Centers "Cultivation of Microorganisms", "Molecular and Cell Technologies", and "Chromas" for strains maintenance, analytical assistance, and genes sequencing. We especially thank the anonymous reviewers for their criticism and valuable suggestions that greatly helped us in upgrading and improvement of the manuscript.
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