English: Light micrograph of living Opalina ranarum cell. Anterior to the top. Waves of activity of the flagella are evident as lines of ridges running at an angle to the axis of the cell.
Français : Micrographie optique d'une cellule vivante d'Opalina ranarum. En haut : le côté antérieur. Des vagues d'activité des flagelles sont évidentes sous forme de lignes de crêtes faisant un angle avec l'axe de la cellule.
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