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Macroautoradiographs of three maize leaves which were labeled with 14CO2 for 15 min in the middle section. (A) Unstimulated control leaf, (B) cold-shocked leaf at the tip (starlet) and (C) wounded leaf at the tip (starlet). The leaves were stimulated once per min. At the white circles within the labeled leaf blades samples were taken for microautoradiography.
