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On The Cover: Chloroplasts of maize seedlings convert particular cytidines to uridines, changing the encoding amino acid and sometimes changing an ACG start codon (left) to an AUG start codon (right). The amino group (blue and white spheres) is replaced with a double-bonded oxygen (large magenta sphere) in uridine. Maize chloroplast extracts capable of editing exogenous RNAs can be used to identify features of cis- and trans-acting factors. The RNA codons were built in COOT and rendered in PyMOL by Changrui Lu (Cornell University). For details see the article by Heller et al., pages 7314–7319.

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