Copyright information:Taken from "Codon conservation in the influenza A virus genome defines RNA packaging signals"Nucleic Acids Research 2007;35(6):1897-1907.Published online 1 Mar 2007PMCID:PMC1874621.© 2007 The Author(s) Dots indicate individual codon scores while lines delineate a moving average taken over a window of 10 residues. For () M and () NS segments, data for the spliced gene products (blue dots and green lines) are plotted on the same scale with the appropriate degree of overlap. Bars above plots represent areas of dual coding capacity. Bars below plots represent packaging signals known from reverse genetics experiments (black lines) or inferred from sequencing studies of DI RNAs (grey lines). Arrow heads indicate splice donor and acceptor sites.