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Increase of steady-state mRNA for IPP isomerases ipiHp1 (A) and ipiHp2 (B) in response to exposure to high light intensity precedes that for a β-carotene-C-4-oxygenase gene (C) as shown by reverse transcription–PCR for cells of Haematococcus wild type. Times of exposure to 150 μmol photon m−2⋅s−1, after from 20 μmol photon m−2⋅s−1, are indicated at the bottom.
