Table 1 Number of organisms and introns for each clade as available from the NCBI Genome RefSeq database*.

From: Statistical analysis of synonymous and stop codons in pseudo-random and real sequences as a function of GC content

Clade

#Species

#Introns

Archaea

1,027

–

Eubacteria

461

–

Protozoa

94

771,653

Fungi

481

1,605,788

Plants

157

6,873,069

Invertebrates

316

24,464,214

(Non-mammalian) Vertebrates

296

60,714,298

Mammals

189

38,186,671

Viruses

11,542

–

  1. *Downloaded from ftp.ncbi.nlm.nih.gov/genomes/refseq/ (19/12/2022). Here, we only count introns with a minimum length of 100 bases and do not consider archaeal, bacterial, and viral introns.
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