ALA-S: δ-aminolevulinic acid synthase; dNTP: Desoxyribonucleotide phosphate; INH: 4-bromo-3-(5'-carcoxy-4'-chloro-2'-fluoro-phenyl)-1-methyl-5-fluoromethyl-pyrazol; PBG: Porphobilinogen; PCR: Polymerase Chain Reaction; PPI: Plasma Porphyrin Index; PPOX: Protoporphyrinogen oxidase; PROTOgen IX: Protoporphyrinogen IX; PROTO IX: Protoporphyrin IX; RT: Retrotranscription; VP: Variegate Porphyria. Here, PPOX is linked to porphyria.