Metabolites
5-ALA	5-aminolevulinic acid/aminolevulinate
COPRO	coproporphyrin
URO	uroporphyrin
PBG	porphobilinogen
HMB	1-hydroxymethylbilane/pre-uroporphyrinogen
UROgen	uroporphyrinogen
COPROgen	coproporphyrinogen
PROTOgen	protoporphyrinogen
PpIX	protoporphyrin IX
Organelles
PM	plasma membrane
ER	endoplasmic reticulum
GA	Golgi apparatus
OMM/IMM	outer/inner mitochondrial membrane
IMS	inner mitochondrial space
END	endosome
LYSO	lysosome
Enzymes
ALAS	ALA-synthase
PLP	pyridoxal-5’-phosphate
ALAD	ALA-dehydratase
PBGD	porphobilinogen deaminase
UROS	uroporphyrinogen III cosynthase
UROD	uroporphyrinogen decarboxylase
CPO	coproporphyrinogen III oxidase
PPO	protoporphyrinogen oxidase
FECH	ferrochelatase
HO	heme oxygenase
BVRA	biliverdin reductase-A
UGT1A1	UDP-glucuronosyltransferase 1A1
Others
PDT	photodynamic therapy
PDD	photodynamic diagnosis
ROS	reactive oxygen species
TCA	tricarboxylic acid
CLIP	cytosolic labile iron pool
ISC	iron-sulfur cluster
CO	carbon monoxide
ABCB	ATP-binding cassette subfamily B member