The sorting protocol of microalgae cells was based upon the differential and relative distribution of red fluorescence (representing CAF of microalgae) against forward-light scatter (FSC), representing cell size and green fluorescence vs. red fluorescence simultaneously. When a cell population exhibited weak CAF, the GAF was utilized for supplementary confirmation. With excitation at 488 nm using an argon laser, the CAF of microalgae was measured through a 635 ` 20 nm long- pass filter and GAF via a 530 ` 30 nm band-pass filter. Two- dimensional profiles of FSC against red fluorescence and green fluorescence vs. red fluorescence were electronically plotted, where the sorting windows were positioned at optimal areas within the distribution of an algal cell cluster. Using a twodimensional cytogram of GAF against CAF for the selection and isolation of microalgae represents an efficient sorting technique. For example, as can be seen in Fig. 2a and b, the microalgae group labelled ‘R4’ had a weak CAF, but a high GAF. To establish axenic cultures during the sorting process, cells were selected on the basis of the highest relative fluorescence according to the procedure described by Sensen et al. [7]. Fig. 2a and b shows typical examples of flow cytometric dot plots for an enriched microalgae culture, where regions displayed in rectangle show the sort gates associated with each algal cluster. Individual sorted single cells were placed into separate culture wells of a 48-well incubation plate (Iwaki, 3830-048), where each well contained 0.5 mL of f/2 and Walne medium.