Three targeting sequences for peroxisomal proteins have been identified. Two of them, PTS1 and PTS2, identify peroxisomal matrix proteins; PEX19BS identifies peroxisomal membrane proteins instead. Depending on the type of PTS signal the proteins might carry, they are translocated to the peroxisome via Pex5 (PTS1 receptor), Pex7 (PTS2 receptor) or Pex19 (Membrane protein receptor).