The smallest green algae in freshwater. (IMAGE) University of Tokyo Caption This microscopic fluorescent image of a Medakamo hakoo shows a chloroplast (red), a nucleus (green) and a cytoplasm (blue) in the alga’s cell. The white scale bar indicates 500 nanometers (0.0005 millimeters). Credit 2023 Tsuneyoshi Kuroiwa Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.