Genomic equivalent lengths for model organisms.

, = 2 to 10, of chromosomes of model organisms. The 's given are meanSD averaged over chromosomes of the organism, except for the single chromosome E. coli. See Table S2 for list of all computed 's. () Number in parentheses indicates total number of complete chromosomes in organism. () Abbreviations: gn, gene; gn, intergenic; ex, exon; in, intron. Percentage given indicates portion of complete sequence. “N-runs” or gaps in sequences are not counted. () Ex and in segments selected as given by Genbank; sum of percentages for ex and in may be less than or exceed that of gn due to incomplete or duplicated segments. () () computed only if category has more than one sequence whose length exceeds .