Fig. 4.

Determination of the sequence involved in p56 binding to psbE mRNA. Schematic representation of altered regions of psbE mRNAs used as competitors are shown above. One femtomole of the wild-type psbE RNA labeled at the +1 residue was used as a substrate, and 1 pmol of each competitor was added. Cross-linking assays were as described in Fig. 3. 0, without competitor.