lIt has frequently been repeated under various conditions.
lWe have yet to produce two of the 20 needed amino acids in any such
experiments.
lWe regularly produce lots of other amino acids not in the
needed 20.
lWe regularly get lots of other stuff that would reactively interfere with the
following needed steps.
lWe need a reducing atmosphere (less than 1% oxygen), but photo dissociation
seems a problem here.
lAmino acids in life are all left-handed.