1.   And even then, I bet that people with pig valves get lots of pig jokes.

2.   A. Well, pig valves are another thing, entirely.

3.   But she noted that pig valves are now seen as acceptable replacements in human hearts.

4.   The pig valves now used in humans stiffen and stop working after a time.

5.   After a series of tests Tuesday, doctors recommended replacing the pig valve.

6.   Eighty-year old Senator Jesse Helmsopen-heart surgery this week to replace a worn-out pig valve inserted in his heart ten years ago, aides said.