a type of cell destroys bacteria that enters the body
gram_negative_cell_wall is bacterial_cell_wall. bacteroid is bacteria. gram_negative_cell_wall is not bacterial_cell_wall. spirilla_bacterium is bacterium. bacteroidetes is bacterium. gram_negative_bacterium is bacterium. yersinia_enterocolitica is not bacterium. bacterial_cell_wall is cell_wall. gram_positive_cell_wall is bacterial_cell_wall. bacteroidetes is not bacterium.