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Table 1 Presence (+) or absence (−) of connexins and pannexins in the main taxonomic groups of multicellular animals. Lack of both types of GJ was found in some taxonomic groups: Echinodermata (12 spicies), Hemichordata(2), Tardigrada(2), Nematomorpha(1), Onychophora(1)

From: Are there gap junctions without connexins or pannexins?

  Taxon Species Pannexins Connexins
Deuterostomia Vertebrata Homo sapiens + +
Tunicata Ciona intestinalis + +
Cephalochordata Branchiostoma lanceolatum +
Echinodermata Ophionereis fasciata
Patiriella regularis
Strongylocentrotus purpuratus
Apostichopus parvimensis
Hemicentrotus pulcherrimus
Ophiothrix spiculata
Apostichopus japonicus
Acanthaster planci
Eucidaris tribuloides
Lytechinus variegatus
Patiria miniata
Antedon mediterranea
Hemichordata Ptychodera flava
Saccoglossus kowalevskii
Protostomia Plathelminthes Hymenolepis diminuta +
Orthonectida Intoshia linei +
Annelida Capitella teleta +
Brachiopoda Lingula anatina +
Molluscs Aplysia californica +
Acanthocephala Echinorhynchus gadi +
Bryozoa Membranipora membranacea +
Cycliophora Symbion pandora +
Entoprocta Loxosoma pectinaricola +
Nematoda Caenorhabditis elegans +
Arthropoda Drosophila melanogaster +
Tardigrada Hypsibius dujardini
Ramazzottius varieornatus
Nematomorpha Paragordius varius
Onychophora Euperipatoides rowelli
Ctenophora Pleurobrachia bachei +
Cnidaria Hydra vulgaris +