Among the stock activity stories for Friday, June 21, from AP Business News:

— Shares of Idenix Pharmaceuticals Inc. tumbled after the Food and Drug Administration delayed human testing of the drugmaker's hepatitis C treatment IDX20963.

— Shares of Synta Pharmaceuticals Corp. shot up after the drugmaker's biggest shareholder disclosed the purchase of more stock.

— OSI Systems Inc.'s shares soared after the company announced a settlement with the federal government that will allow use of its full-body scanners to continue.

 

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