Motion of Euglena gracilis: Active fluctuations and velocity distribution P. Romanczuk, M. Romensky, D. Scholz, V. Lobaskin and L. Schimansky-Geier Eur. Phys. J. Special Topics, 224 7 (2015) 1215-1229 Published online: 24 July 2015 DOI: 10.1140/epjst/e2015-02456-1