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Effect of simulated shade on hypocotyl length. Changes in hypocotyl length in response to simulated vegetative shade were analyzed in wild-type (WT), phytochrome B mutant (phyB), and phytochrome A phytochrome B double mutant (phyAB) seedlings. Seven-day-old white light-grown seedlings were either maintained in white light (solid bars) or transferred to white + FR light (gray bars) for 24 h, after which mean (±se) hypocotyl lengths were measured.
