“…, N6-methyl-3-deaza-adenosylhomocysteine, N6-dimethyl-3-deaza-adenosylhomocysteine, S-inosylhomocysteine, S-cytidylhomocysteine and S-guanosylhomocysteine were kindly given by Dr. R. T. Borchardt, Department of Biochemistry, University of Kansas, Lawrence, KS, U.S.A. 5'-Isobutylthioinosine, 5'-n-butylthioinosine and 5'-methylthioinosine were prepared by enzymic deamination of the corresponding adenosyl derivatives with a non-specific adenosine deaminase from Aspergillus oryzae (Schlenk & ZydeckCwick, 1968;Zappia et al, 1978). 5'-Methylthio-3-deaza-adenosine and 5'-isobutylthio-3-deaza-adenosine were kindly given by Dr. G. Stramentinoli, BioResearch Co., Linate, Italy.…”