Figure 3.

Redox Activation of PRK in Vaucheria litorea and Elysia chlorotica.

Enzyme activity was measured in crude extracts of algal and sea slug samples collected 5 h into the light (white columns) or dark (black columns) period. The sea slugs had been starved for 0 or 3 months, as indicated. The extracts were prepared in the presence (+DTT) or absence (–DTT) of reducing agent and assayed as described in ‘Methods’. The bars indicate the standard error of the mean with n  =  6 for each algal measurement and n  =  3 for each sea slug measurement.