|Frequency of various types of GenBank features|
Frequency of feature count for 2052 randomly selected genes. Gene annotations often do not include mRNA records, but most (95%) have at least one CDS record. Miscellaneous RNA features are relatively rare. Genes may also contain multiple subsequence features that include variations in exon locations, identical reports from multiple authors, or genes in other reading frames. This table only includes genes for the ~80% of genes for which precise genomic location.
Neff et al. BMC Bioinformatics 2013 14:1 doi:10.1186/1471-2105-14-1