(GA) (SA) Adleman 2 (1) tRNA aaRS (TDGA) aaRS TDGA (2) GA GA GA GA Woods ( ) Baeck ( ) GA (1) DNA WT WT tRNA L- tRNA TyrRS WT TyrRS TyrRS X L- 20 20 20 2=1,600 16,000 TyrRS WT (2) (1) in vitro Virus in vitro virus RNA 3’ OMe mRNA 3’ Y Y RNA Y RNA RNA in vitro virus In vitro virus RT-PCR SR SR T7RNA M T7 RNA-Z in vitro selection (2) in vitro virus Met DNA Y YLBS DNA MLSDS (3) RNA mer 1980 CDMA (1)