Table 2.

Summary of abiotic mechanisms for generation of amino acid enantiomeric excesses.

Mechanism	Maximum Reported Enantiomeric Excess	Chiral Preference	Influence Exerted Inside or Outside Meteorite Parent Body
Ultra-Violet circularly polarized light (UV-CPL)	2.5%	Dependent on chirality of light	outside
Parity violating energy differences (PVED)	<0.01%	L	both
Destruction of 14N nuclei by stellar anti-neutrinos	0.02%	L	outside
Irradiation with radioactive decay products	<1%	Dependent on chirality of radiation	inside