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Micrographs of crystals. (a) wt-RNase HI (E. coli); (b) RNA duplex (CAC UUG ACC UGG CUC)–(GAG CCA GGU CAA GUG) (Y–R in Table 1 ▶), diffraction limit ∼2.1 Å; (c) complex between RNase HI and RNA duplex Y–R; (d) complex between RNase HI and RNA duplex (GCA CUU GAC C)–(GGU CAA GUG C) (Y6–R6 in Table 1 ▶).
