In contrast to homozygous wild-type birds, highly significant reductions in tvb mRNA levels in tvb s1/r3 individuals were observed, 68%±5% and 52%±4% of control values for the 5′ and 3′ systems, respectively (Figure 2B ).
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A premature stop codon within the <i>tvb</i> receptor gene results in decreased susceptibility to infection by avian leukosis virus subgroups B, D, and E.
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