Figure 1.
Distribution of genomic lengths for (a) Homo sapiens, (b) Drosophila melanogaster, (c)Caenorhabditis elegans, and (d) Arabidopsis thaliana. Dark shading indicates strong hits. Weak hits (lightly shaded) represent cDNA-to-genomic alignments with <3 exons or <50% of the cDNA length aligned. An overwhelming majority of these weak hits are actually complete alignments with only one or two exons. Instances in which <50% of the cDNA is aligned represent 7.3%, 3.3%, 1.2%, and 0.9% of the genes in the four organisms, respectively.
