003340000a22001450004500060000800000082002400008100002200032100001900054245002500073260002900098260000900127300000800136490002600144650001800170 a100 a574. 192 5 MET.12.1 aCossman, Lawrence aMoldava, Kivie aNucleic acids Part.A aNew York, Academic press c1967 a764 aMethods in enzymology aNucleic acids