41.   Glucosamine sulfate is a synthetic version of a body substance that helps build cartilage, the tough tissue that lines the joints.

42.   In a continuous cat-and-mouse game, athletes have been able to keep a step ahead of drug-testers by using synthetic versions of naturally occurring substances.

43.   Recombinant EPO is a synthetic version of the hormone.

44.   Sherman said the company has not succeeded in making a synthetic version so far.

45.   Sweden first used real wolf urine, but the university now produces a synthetic version which keeps its odor for more than nine months, the newspaper said.

46.   The university since has produced a synthetic version which keeps its odor for more than nine months, the newspaper said.