Characteristic Average
Number of exons 8.8
Size of internal exon 145 bp
Size of intron 3,365 bp
Size of 5′ untranslated region 300 bp
Size of 3′ untranslated region 770 bp
Size of coding region 1,340 bp
Total length of gene 27,000 bp
Table 20.5: Average characteristics of genes in the human genome