open tetrapyrrolic chromophores ( bilirubin and biliverdin ) did not have any significant effect on the phototransformability of the far-uv cd signal of the phytochrome , whereas closed tetrapyrroles ( chlorophyllin and hemin ) almost completely blocked the increase in the far-uv cd signal upon pr to pfr phototransformation .
C0005437
bilirubin
C0005446
biliverdin