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The Long-Hypocotyl Phenotype of csa1 Seedlings Is Red Light Specific.
(A) Wild-type, phyB, and csa1 mutant seedlings grown under continuous red, far-red, blue light, or darkness for 3 d.
(B) Hypocotyl-length fluence-rate response curves of wild-type and csa1 mutant seedlings.
