Fig. 4 Comparison of the BMAA production ability by diatoms. Positive results of BMAA were detected in these diatom strains isolated from the coastal area of China and the unit of BMAA concentration is μg g-1 dry weight. The data without error bars were obtained in the first batch of cultures and the wet weight was converted to dry weight. And the data with error bars were obtained in the second batch of cultures, in which each group was set up in three parallel cultures and dry weight was used for microalgal cells.