ZAP70 and B-cell chronic lymphocytic leukemia: [ZAP70 gene]-gene_plays_role_in_process-[Ligand Binding]-biological_process_involves_gene_product-[LTB4R protein, human]-gene_product_expressed_in_tissue-[Lymphoid Tissue]-is_normal_tissue_origin_of_disease-[Chronic lymphocytic leukaemia refractory]