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. 1997 Apr 29;94(9):4262–4266. doi: 10.1073/pnas.94.9.4262

Figure 2.

Figure 2

Composition of the 8-17 and 10-23 catalytic motifs. The DNA enzyme (bottom strand) binds the RNA substrate (top strand) through Watson–Crick pairing. Cleavage occurs at the position indicated by the arrow. R = A or G; Y = U or C.