red blood cells are a part of blood
blood is body_part. red_blood_cell is not blood_cell. mammalian_red_blood_cell is rbc. red_blood_cell is blood_cell. blood is red. blood has not red_blood_cells_white_blood_cells_platelets_and_plasma blood has red_blood_cells_white_blood_cells_platelets_and_plasma blood_cell is animal_or_body_part.