Selection for the compactness of highly expressed genes in Gallus gallus.

For 377 intron-absent genes, we also found a significant trend between expression level and CDS length (see Figure 1f ), while such relationship does not exist between gene size and expression level ( P = 0.8460, r = -0.01003).

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The summed R 2 for the correlation coefficients reported in the figures is only 3% and if we remove nominally significant results (as these would likely be discarded if multiple test corrections were actually applied) the R 2 reduces to <1%.

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