On several occasions we have observed retrovirus-like particles ( RVLPs ) by transmission electron microscopy ( EM ) of cultured T cells from a patient with MS .
on several occasions we have observed retrovirus-like particles ( rvlps ) by transmission electron microscopy ( em ) of cultured t cells from a patient with ms .
O O O O O O B-virus I-virus O B-virus O O B-other_name I-other_name I-other_name O B-other_name O O B-cell_line I-cell_line I-cell_line O O B-multi_cell O B-other_name O