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A chloroplast photosystem I reaction center mutation. ac-u-g-2.3. of Chlamydomonas reinhardtii has been complemented with a wild type psaB gene to restore photosynthetic competence. The mutation was mapped in the psaB coding sequence by chloroplast transformation using subcloned restriction fragments of psaB. The mutation was found to be a single base pair deletion resulting in a reading frame shift...