51.   The researchers found that coral skeletons and clam shells did not even contain elevated levels of arsenic.

52.   The treatment removes impurities from their blood but is ineffective at reducing elevated phosphorous levels, a condition that can lead to bone disease.

53.   These fish contain elevated levels of mercury, a poison that attacks the central nervous system.

54.   Whatever his final decision, Trump said he saw nothing wrong with trying to enter the profession at such an elevated level.

55.   Only one in three men with elevated PSA levels who undergo biopsies are subsequently found to have cancer.

56.   A lab spokesman said air monitoring has detected no elevated levels of radioactivity in the area.

57.   A lab spokesman said air monitoring has detected no elevated levels of radioactivity.

58.   About two hours later, their blood contained elevated levels of flavonoids and antioxidants, Keen said.

59.   About three-quarters of men with prostate cancer have elevated levels of a protein called prostate-specific antigen -- PSA.

60.   At elevated levels, mercury can be dangerous for humans and can cause severe neurological damage in unborn children.