Human Translocator Protein, TSPO ELI

Can bind protoporphyrin IX and may play a role in the transport of porphyrins and heme (By similarity).

Promotes the transport of cholesterol across mitochondrial membranes and may play a role in lipid metabolism (PubMed: 24814875), but its precise physiological role is controversial.

It is apparently not required for steroid hormone biosynthesis.

Was initially identified as peripheral-type benzodiazepine receptor; can also bind isoquinoline carboxamides (PubMed: 1847678).