In the mid-1990s Vertex chemists crafted compounds that block a key kinase protein that unleashes toxic immune-system molecules in arthritic joints.

FORBES: Machine Gunner

And the international community -- notably the United States's key European allies and the Russians -- will continue to block any consensus on coordinated military responses.

CENTERFORSECURITYPOLICY: The Moment Of Truth: The US Must Stop Serbian Aggression Now

But the IRS' attack on split-dollar insurance came months after key congressmen had moved to block the ploy.

FORBES: The new giving game

Both Sugen and Genentech are rushing to conduct final-stage human testing of drugs that block the action of a key protein, called VEGF.

FORBES: Targeting Tumors

And I'm told that the key voting block, the swing voters in this upcoming Democratic primary, are African-American women, women just like yourselves.

NPR: S.C. Activists Weigh In on Obama-Clinton Race Rift

With 6:33 left in the first half, Ware, who has played a key role in Louisville's 14-game winning streak, jumped to try and block Tyler Thornton's 3-point shot.

NPR: Louisville Beats Duke 85-63 To Reach Final Four

One block north, hand-painted signs direct you to arguably the best key lime pie that money can buy.

BBC: A remote hook in New York��s harbour