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Carotenoids were detected at 450 nm. Profiles obtained from M. circinelloides wild-type, MS7 (leuA1, carP4) and MS21 (leuA1, carR9) strains, as well as T7 and T21 transformants (MS7 and MS21, respectively, transformed with the P. blakesleeanus carRA gene) are shown. β: β-carotene, L: Lycopene. Y-axis not scaled.
