  A mechanism for creating an enantioenrichment in the amino acids, the
building blocks of the proteins, that involves global selection of one
handedness by interactions between the amino acids and neutrinos from
core-collapse supernovae is described. The chiral selection involves the
dependence of the interaction cross sections on the orientations of the spins
of the neutrinos and the 14N nuclei in the amino acids, or in precursor
molecules, which in turn couple to the molecular chirality. It also requires an
asymmetric distribution of neutrinos emitted from the supernova. The subsequent
chemical evolution and galactic mixing would ultimately populate the Galaxy
with the selected species. The resulting amino acids could either be the source
thereof on Earth, or could have triggered the chirality that was ultimately
achieved for Earth's proteinaceous amino acids.
