Coproporphyrinogen I:

A. Intermediate in heme synthesis
B. Intermediate in heme degradation
  1. A only
  2. B only
  3. Both A and B
  4. Neither A or B


Coproporphyrinogen I is an apparently useless side product of heme synthesis. It is not an intermediate on the pathway to heme. The coproporphyrinogens have nothing to do with heme degradation.

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