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qRT-PCR measurement of mRNA levels showing the role of spermidine synthesis in gene expression under chill-light stress. Bars: dark gray, Synechocystis 6803; light gray, the CASDC mutant. rbp1, RNA-binding protein 1; tsf, EF-Ts; rpoA, α subunit of RNA polymerase; slr0338, probable oxidoreductase.
