tokens: Tumor samples , obtained from 129 patients who underwent surgery between January 1987 and December 1988 , were processed for staining by an immunohistochemical procedure ( avidin-biotin complex ) .
folded_tokens: tumor samples , obtained from 129 patients who underwent surgery between january 1987 and december 1988 , were processed for staining by an immunohistochemical procedure ( avidin-biotin complex ) .
labels: B-tissue I-tissue O O O O B-multi_cell O O O O O O O O O O O O O O O O B-other_name I-other_name O B-protein_complex I-protein_complex O O