tokens: The alpha2beta1 integrin , a collagen receptor on platelets and megakaryocytes , is required for normal platelet function .
folded_tokens: the alpha2beta1 integrin , a collagen receptor on platelets and megakaryocytes , is required for normal platelet function .
labels: O B-protein_family_or_group I-protein_family_or_group O O O O O B-cell_type O B-cell_type O O O O B-other_name I-other_name I-other_name O