Figure 1
Figure 1. Generation of uroporphyrinogen III (uro'gen III) by uroporphyrinogen III synthase (UROS). The enzyme catalyzes the cyclization of HMB with concomitant inversion of ring D to yield the III isomer of uro'gen.10 a indicates acetate; p, propionate.

Generation of uroporphyrinogen III (uro'gen III) by uroporphyrinogen III synthase (UROS). The enzyme catalyzes the cyclization of HMB with concomitant inversion of ring D to yield the III isomer of uro'gen.10  a indicates acetate; p, propionate.

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