One continuing challenge is the need to suppress transplant patients' immune systems to prevent their bodies from rejecting ...

It's no coincidence that our bodies feel a little creakier as we age. The trillions of cells that make up our skeleton age too, and some change in ways that weaken the very structure of our bones.

At the same time, testing on animal cells can be particularly useful in determining whether microparticles found in creams, gels, and other common products might seep into human skin and ...