 Gbogbo awon wonyi ni L-stereoisomers (isomer "lapa-osi"), botilejepe awon D-amino acid ("alapa-otun") die wa  ninu eya idaabobo ara bacteria, won le je neuromodulator (D-serine), won tun wa ninu awon egbogi kankan.. 
Beach (Amy Cheney Beach), Clayton Johns, ati Charles Gilbert Spross lo ti sọ àwọn ewi rẹ̀ di orin.. 