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Table 2 The unclassified sequence from the Sargasso Sea is unlikely to represent a fragment of a viral genome. TBLASTN searches were conducted at NCBI using as a query the 59 residues from the Sargasso Sea sequence (Accession AACY01369547) that formed the putative C-extein. These 59 residues are encoded on the complementary strand, from base 556 to base 732. Each search was restricted to one of the six groups outlined below.

From: Multiple, non-allelic, intein-coding sequences in eukaryotic RNA polymerase genes

Accession Sequences producing significant alignments E value
Fungi   
   gb DQ302778.1 Entomophthora muscae AFTOL-ID28, RPB2 4 × 10-9
   gb DQ521419.1 Auricularia auricula-judae AFTOL-ID1681 7 × 10-9
   gb DQ234553.1 Hydnum albomagnum AFTOL-ID 471, RPB2 1 × 10-8
   gb AY485624.1 Hydnum repandum RPB2 1 × 10-8
   gb DQ302787.1 Umbelopsis ramanniana AFTOL-ID 144, RPB2 2 × 10-8
Metazoa   
   gb XM_793194.1 Strongylocentrotus purpuratus LOC593725 5 × 10-7
   dbj AK114672.1 Ciona intestinalis cDNA, clone:cieg010h22 1 × 10-6
   gb AC007441.9 Drosophila melanogaster clone BACR10E03 2 × 10-6
   gb BT028050.1 Gasterosteus aculeatus clone CNB114-G10 2 × 10-6
   gb U10333.1 Caenorhabditis elegans RNA polymerase II 2 × 10-6
Plantae   
   emb AJ565937.1 MGU565937 Mimulus guttatus partial RPB2 9 × 10-7
   gb DQ029103.1 Spirogyra sp. UWCC FW670 RPB2 1 × 10-6
   gb AF020844.1 Marchantia polymorpha RPB140 (RPB2) 1 × 10-6
   gb AY596718.1 Tetralocularia pennelii (RPB2) 1 × 10-6
   gb AY563264.1 Selaginella densa RNA polymerase II (RPB2) 1 × 10-6
   emb AJ566358.1 GSP566358 Gardenia sp. Oxelman 2319 (RPB2) 1 × 10-6
Archaea   
   gb AE010299.1 Methanosarcina acetivorans str. C2A (rpoB) 2 × 10-6
   gb AE008384.1 Methanosarcina mazei strain Goe1 (rpoB) 2 × 10-6
   gb CP000099.1 Methanosarcina barkeri str. fusaro 3 × 10-6
   gb AE000782.1 Archaeoglobus fulgidus DSM 4304 (rpoB1) 4 × 10-6
   emb BX957222.1 Methanococcus maripaludis S2 5 × 10-6
   emb X14818.1 Sulfolobus acidocaldarius rpoB 9 × 10-6
Viruses   
   gb AF389451.1 Tiger frog virus, complete genome 2 × 10-4
   gb AY548484.1 Frog virus 3, complete genome 4 × 10-4
   gb AY666015.1 Grouper iridovirus, complete genome 0.001
   gb AY150217.1 Ambystoma tigrinum stebbensi virus 0.001
   gb AF397202.1 Regina ranavirus clone PstI-3.8 0.001
   gb AY653733.1 Acanthamoeba polyphaga Mimivirus 0.001
   emb AJ890364.1 Emiliania huxleyi virus 86 isolate Ehv86 0.003
Eubacteria   
  No significant similarity found.