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The effect of irradiance on the level of α-carotene (total cis + trans) calculated as a percentage of total carotene (i.e. α-carotene + β-carotene; n = 3 ± se) (A) and the level of 9-cis and all-trans α-carotene (calculated as a percentage of total α-carotene; n = 3 ± se) (B). Black bars, All-trans; white bars, 9-cis.
