Fig. 5.

Action spectra for the repellent response in transformants containing SRII/NpHtrII (blue circles), BR triple mutant/HsHtrII (green circles), and Pho-81 devoid of rhodopsins (squares). The absorption spectra (dotted lines) were measured by using the membrane fraction in the presence of 0.1% n-dodecyl-β-d-maltoside (26). We measured phototaxis responses as swimming reversal frequency changes to a 5-ms photostimulus for SRII/NpHtrII and 10-ms photostimuli for the BR triple mutant/HsHtrII and Pho-81.