Overrepresented GO categories in intron-lost and intron-gained genes.

aA hypergeometric test was used and only GO categories with P values lower than 0.05 were shown.
*GO categories that were both present in intron-lost and intron-gained genes. The null hypothesis is that the intron-lost and intron-gained genes were randomly clustered among the GO categories. However, three out of four GO categories of intron-gained genes were shared by intron-lost genes, which implied that intron loss and gain in fission yeast might share some similar mechanisms.