prov:value
| - lected from the group consisting of A, I, L, M, F, W, Y and V; B2 is an amino acid selected from the group consisting of R, N, D, C, Q, E, G, H, K, P, S, and T; Z1 is an amino acid selected from the group consisting of A, I, L, M and V; and Z4 is an amino acid selected from the group consisting of R, H and K. For example, some further evolved GAT enzymes of the invention comprise one or more of: a
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