Light response of the psaD, psaE and psaH gene families of photosystem I was studied in etiolated seedlings and dark-adapted mature leaves of Nicotiana sylvestris using RNase protection assays and immunoblot analysis. The results suggest that the initial light-response consists of at least two types; a very quick response found only in the psaDb gene, and a slower response common to all the examined genes.
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Yamamoto et al. (1995) studied this question.