Efalizumab is made to target and destroy only certain cells in the body.

The message is registered as pain by certain cells in the body.

Cytolysins that have a specific action for certain cells are named accordingly.

Such characteristics appear to be brought about by minute changes in the genetic makeup of certain cells.

Scientists believe that during development, certain cells are capable of taking on different identities.

If certain cells don't die off, then you affect development, like what happens with a fetus.

Or, perhaps certain cells might be biconcave at one point in their life cycle, but not another.

Their application is expected to be based on counts of certain immune cells.

But the gun could only go off in certain cells and then only if a person deliberately pulled it.

He didn't want to take someone else's spot, though he wasn't sure how anyone could find a certain cell among these identical units.