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Type I meACP (A, E and I), rat FAS ACP (B, F and J, PDB ID: 2PNG), NSAS PKS ACP (C, G and K, PDB ID: 2KR5) and Type II actinorhodin PKS ACP (D, H and L, PDB ID: 1AF8). The invariant Ser is shown as blue stick and labeled. The protein surfaces are colored as white (hydrophobic), blue (basic) and red (acidic) with the same electrostatic potential scale.
