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The TL Motif Structure in M. HhaI and M. HaeIII. Images taken from crystal structures of M. HhaI (left) and M. HaeIII (right) showing the loop around the conserved TL motif (T250, L251 in M. HhaI and T237, V238 in M. HaeIII). The loop is shown in red with yellow residues indicating the amino acids used in the proposed scheme for describing the methyltransferase recognition sequence. DNA is shown as narrow blue sticks.
