Enzymatic activity which hydrolyzes diadenosine 5',5"'-P1,P4-tetraphosphate (Ap4A) yielding ADP has been identified in extracts of eubacteria, Escherichia coli and Acidaminococcus fermentans, and of a highly thermophilic archaebacterium, Pyrodictum occultum. Specific Ap4A (symmetric) pyrophosphohydr...
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