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On the Cover: When grown in the absence of light, elongation of Arabidopsis hypocotyls was unaffected by the presence of the auxin transport inhibitor naphthylphthalamic acid (NPA). As the light level increased, so did the magnitude of the NPA-induced hypocotyl inhibition. In Jensen et al. (pp. 455-462), the NPA response is shown to be fluence-rate dependent. Although the lengths of hypocotyls from dark-grown plants were unaffected by 1.0 µm NPA, the gravity response was disrupted. Experiments conducted under various colors of light and with photoreceptor mutants indicated that multiple photoreceptors were involved in the phenomenon. Additional experiments with hormone mutants further suggested that auxin has a more important role in elongation in light-grown than in dark-grown seedlings.