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Table 4 Chordata huntingtin gene structure, coding region (CDS), and length percentage of repetitive elements (Rpt) in intronic sequences.

From: Huntingtin gene evolution in Chordata and its peculiar features in the ascidian Ciona genus

   Exon N° Length (bp) Intron L %
    CDS Gene Introns Rpt Simple Interspers Retroel DNA el
Mammalia Homo sapiens 67 9432 165202 155770 38.5 1.3 37.2 33.9 2.2
  Mus musculus 67 9357 146932 137575 38.2 1.9 36.2 34.7 0.5
  Rattus norvegicus 67 9351 145591 p 136240 p 35.4 2.6 32.9 31.3 0.9
Aves Gallus gallus 67 9351 73424 p 64073 p 5.5 0.6 4.9 4.9 0
Amphibia Xenopus tropicalis 67 9066 p 79087 p 70021 p 11.0 0.9 10.0 0 9.3
Teleostei Danio rerio 67 9363 79017 p 69654 p 29.9 5.3 24.6 4.3 20.3
  Fugu rubripes 67 9444 21324 11880 1.1 1.1 0 0 0
  Tetraodon nigridoviridis 67 9435 22257 12822 2.4 1.8 0.5 0 0.5
Ascidiacea Ciona savignyi 61 8835 45085 36249 9.8 2.7 7.1 4.4 2.1
  Ciona intestinalis 61 8838 32283 23445 12.5 5.8 6.7 1.6 5.1
  1. Simple: satellites, simple repeats, low complexity repeats and small RNAs. Interspers: interspersed repeats. Retroel: retroelements. DNA el: DNA elements. p: partial sequence. Partial introns in Rattus: 1, 8, 28. Partial introns in Gallus: 46, 47. Partial or unknown exons in Xenopus: 27, 37, 66. Partial or unknown introns in Xenopus: 9, 26, 27, 36, 37, 65, 66. Partial introns in Danio: 1, 6, 8, 11, 13, 18, 25, 44, 49, 59. Intron 61 of Danio was excluded from gene size calculation due to its length (about 254 kb).