tokens: Three molecular clones of HIV-1 , derived from a single isolate ( AL1 ) , exhibited distinct replicative and cytopathic properties during propagation in a human T cell line .
folded_tokens: three molecular clones of hiv-1 , derived from a single isolate ( al1 ) , exhibited distinct replicative and cytopathic properties during propagation in a human t cell line .
labels: O O O O B-virus O O O O O O O B-virus O O O O O O O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O