Imagine that we take mirror reflection of a cell - change each
molecule into its enantiomer.
In physics it's called parity transform - it's not perfectly
conserved, but the differences of energies are many orders of
magnitude smaller than thermal noise in biochemistry - such cell
should function properly (but for example use L-glucose).
http://wikibin.org/articles/chiral-life-concept.html

We don't have (?) technology to construct such cell in this moment,
but maybe in a few dozens of years ...
So I believe it would be wise to discuss about it's possibilities and
dangers...
One of the possibility is that such chiral life would be incompatible
with most of normal parasites...

What do You think about it?