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cDNAs of the T cell receptor beta (TCRB) have been isolated from the anuran amphibian Xenopus and they show strong structural homology to TCRB sequences of other vertebrates. The total number of V beta genes is in the order of 12 per haplotype. The Xenopus V beta are organised in numerous families containing few members like mammals but unlike the chicken. The number of J segments is at least five...
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