A method has been spreading for analyzing DNA fragments from organisms in the environment such as water or soil (environmental DNA or eDNA) to identify species being present there and to estimate their population. In this drawing, men are collecting the river water and amplifying certain DNA sequences using a handheld real-time PCR machine to estimate the population of a certain species of fish.
A woman wearing an ornamental hairpin, or kanzashi, likened to L-serine, is looking at the mirror. A D-serine kanzashi on her hair can be seen in the mirror. Since it has been revealed that at least some D-amino acids play physiological roles, focusing only on L-amino acids might be 'out of fashion.'