Abstract
Although the chemical and physical properties of l -amino acids and d -amino acids are extremely similar, only l -amino acids seemed to have been selected from the origin of life on the primitive Earth. In their chemical evolutionary step, d -amino acids seemed to have been eliminated, and hence it has been considered that all superior living organisms are composed only of l -amino acids. Homochirality is a characteristic signature of life. This asymmetry in biology is assumed to be a feature of fundamental physics, because the natural l -amino acids are more stable than their unnatural mirror images. Until the last 30 years, it has been considered that d -amino acids were excluded from living systems except for d -amino acids in the
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