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Hypocotyl elongation rate in CC3 and SWCC8 under UVB-free white light and LDUVB conditions. Under UVB-free light, CC3 hypocotyl elongation rate (mm/2 d) reached its peak at 7 d after germination, which is much faster than that under LDUVB (A). SWCC8 has a much slow hypocotyl elongation rate (B). **Statistically significant differences of expression level based on t test (P < 0.01).
