highly significantp = 0.00016
A linear statistical model of the relative amount of the D1 protein, with the illumination time, dark time and their interaction as explanatory variables, was highly significant ( F (3,26) = 9.883, p = 0.00016; see Appendix S1 for the full characterization of the model) and showed that the lowering of the amount of the D1 protein due to interaction by illumination and subsequent dark time was significant ( p = 0.0485); the negative effect of illumination alone on the D1 protein was not significant ( p = 0.0791), and dark time alone had no effect ( p = 0.997).