Viral trans-activators such as Tax ( human T cell leukemia virus-1 , HTLV-1 ) and E2 ( bovine papilloma virus , BPV ) proteins are other agents which activate lymphokine gene expression by bypassing T cell receptor ( TCR ) mediated signaling .
viral trans-activators such as tax ( human t cell leukemia virus-1 , htlv-1 ) and e2 ( bovine papilloma virus , bpv ) proteins are other agents which activate lymphokine gene expression by bypassing t cell receptor ( tcr ) mediated signaling .
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