highly significantP -value < 0.001
Remarkably, when comparing the fraction of significant and nonsignificant ORFs within CiCo with the two control datasets, we found highly significant differences with both (chi-squared test, two-tailed P -value < 0.001) ( Fig 3B , right) suggesting that the coding potential of CiCo is not only an inherited feature resulting from their origin from coding genes but might potentially account for their function.