sentences: a type of cell destroys bacteria that enters the body
docs: spirilla_bacterium is bacterium. bacteroid is bacteria. gram_negative_cell_wall is bacterial_cell_wall. bacteroidetes is bacterium. human_cell has membrane yersinia_enterocolitica is bacterium. psychotrophic_bacterium is bacterium. gram_negative_bacterium is bacterium. gram_positive_cell_wall is bacterial_cell_wall. bacterial_cell_wall is cell_wall.