Arsenic transformations by Cyanidioschyzon sp. isolate 5508. Algal cultures were incubated with 20 μM arsenite for the indicated times, and the products were analyzed as described in Methods: ●, As(III); ○, As(V); ▼, TMAO; △, DMAs(V). The data represent the average of 2 replicate cultures. The experiment was repeated 4 times with equivalent results.