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The structures of the individual subunits of the sirohaem decarboxylase. The monomers of AhbA (left) and AhbB (right,) are coloured by secondary structural elements, (helices = red, sheets = blue) and labelled by secondary structure. The termini are indicated N and C. Structural diagrams were produced using CCP4 molecular graphics program (McNicholas et al., 2011).
