This schematic diagram shows the enzymatic formation of one molecule of the monopyrrole porphobilinogen (PBG, in black) from two molecules of 5-aminolevulinic acid (ALA, in blue), under the catalytic direction of the enzyme ALA dehydratase (ALAD). Bond lengths are not to scale.
Ac: acetyl; Pr: propionyl.
Graphic 77451 Version 2.0
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