TCR -contact site heterogeneity was excluded as the selective force in diversity generation since the epitope-encoded sequences were found to be identical within endogenous virus isolates .
tcr -contact site heterogeneity was excluded as the selective force in diversity generation since the epitope-encoded sequences were found to be identical within endogenous virus isolates .
B-protein_family_or_group O O O O O O O O O O O O O O O O O O O O O O B-virus I-virus I-virus O