ACKNOWLEDGEMENTS
We are grateful to J. Rudenskaya from the Faculty of Biology, Moscow State University who provided us with the culture of Euglena gracilis , and to I. Aldobaeva for culturing Dictyostelium . The study was supported by the Russian Science Foundation: FT-IR measurements, grant № 19-13-0011; staining and confocal microscopy, grant № 18-29-13014. This research was done using equipment of the Core Centrum of the Institute of Developmental Biology, Russian Academy of Sciences.