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Table 1 Birds, frogs and cartilaginous fishes lack erk1 gene in their genome

From: ERK1 and ERK2 present functional redundancy in tetrapods despite higher evolution rate of ERK1

  Genes present Proteins detected by western blot
erk1 erk2 ERK1 ERK2
Mammalia Eutheria Mouse Mus musculus
Cattle Bos taurus
Chinese hamster Cricetulus griseus
European rabbit Oryctolagus cuniculus
Metatheria Opossum Monodelphis Domestica
Monotremata Platypus Ornithorhynchus anatinus nd nd
Sauropsida Archosauria Aves Chicken Gallus gallus o  
Greater Rhea Rhea americana o  
Crocodylia Nile crocodile Crocodylus niloticus  
Squamata Garter snake Thamnophis elegans  
Corn snake Pantherophis guttatus  
Bull snake Pituophis catenifer sayi  
Green anole Anolis carolinensis  
Brown anole Anolis sagrei  
Common gecko Tarentola mauritanica  
Testudines Red-eared slider Trachemys scripta elegans
European pond turtle Emys orbicularis
Amphibia Anura African clawed frog Xenopus laevi o  
Caudata Axolotl Ambiostoma mexicanum
Presence in fishes
Euteleostomi Sarcopterygii Coelacanth Latimeria chalumnae nd nd
Actinopterygii Teleosts European sea bass Dicentrarchus labrax
African jewelfish Hemichromis bimaculatus
Polypteridae Bichir Polypterus senegalus
Chondrichthyes Spiny dogfish Squalus acanthias o  
Smaller spotted catshark Scyliorhinus canicula o  
Winter skate Raja ocellata o  
  1. Genomes and EST databases were scrutinized for the presence of erk1/2 exons, if gene is present: if gene is absent: O
  2. Presence of proteins readily detected on Western Blots in this work is indicated:
  3. nd not determined