Suppliers of Pure Preparations

Purines, pyrimidines and their nucleosides and nucleotides are available commercially (Firms 26, 31, 80, 86, 98, 124, 130). Enzymes for degradation of nucleic acids are also obtainable (Firms 26, 154). 

Imformation about manufacture and sources of radioactively labelled compounds is to be found on p. 167 and in the list of firms at the end of this book. 

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