51.   The experiments also suggested that the drug has a very low toxic effect, the researchers said.

52.   The kidney is the most likely organ to suffer toxic effects from uranium.

53.   The oil-eating microbes have no toxic effects, and once they do the job of breaking up the oil, they die off, scientists added.

54.   The safety tests will determine whether they have any toxic effects.

55.   This toxic effect on normal cells limits treatment and can cause serious side effects.