NASA, in concert with the biomedical community, has initiated work using
a rotating bioreactor that offers significant advances in cell culturing
technology on Earth, and thereby enabling remarkable research progress
aboard Space Shuttle, Mir, and - soon - International Space Station.
BTW, this includes cartilage growth in space studies reported recently
by Dr. Lisa Freed of MIT. Some aspects also address the immune system.
The full story is at
http://science.msfc.nasa.gov/newhome/br/bioreactor.htm
:)
D2