Statistically over-represented Gene Ontology or InterPro categories between chicken macrochromosomal and microchromosomal genes. Over-representation of gene categories was examined between the genes on chicken macrochromosomes (chromosomes 1–8, Z and W) and microchromosomes (chromosomes 9–28). The proportion of the macro- and microchromosomal genes is shown in each over-represented category of Gene Ontology (GO) or InterPro (IPR). The classifications of GO categories are indicated by superscripts: CC, cellular component; MF, molecular function; BP, biological process; Numbers indicate the levels of GO hierarchy. Significance for each category is assessed with Fisher’s exact test; *P<0.05, **P<0.01 and ***P<0.001.