Fig. 7
From: Identification of crucial genes and metabolites regulating the eggshell brownness in chicken
Schematic representation of protoporphyrin IX/heme biosynthetic pathway. ALAS1, δ-aminolevulinate synthase 1; ALAD, aminolevulinate dehydratase; HMBS, hydroxymethylbilane synthase; UROS, uroporphyrinogen III synthase; UROD, uroporphyrinogen decarboxylase; CPOX, coproporphyrinogen oxidase; PPOX, protoporphyrinogen oxidase; FECH, ferrochelatase. The red plus sign indicates activation