Influence of reference basis and control strains when comparing oil content. TAG amount is expressed on a μg 10-6 cells basis (A) or a % dry weight basis (B). Two reference strains, CC124 (137C) and the cell wall-less 330 (cw15arg7-7) are shown. Cells were cultured in TAP-N for 2 days. Values are mean of four independent experiments ± SD.