Table 3.

Various transporters that penetrate the BBB.

Influx Transporters	Efflux Transporters	Receptor Transporters
Choline transporter (ChT)	Peptide transport system-6 (PTs-6)	Insulin receptors (IR)
Sodium-coupled glucose transporters (SGLTs)	Breast cancer resistant protein (BCRP)	Insulin-like growth factor receptor (IGFR)
Cationic amino acid transporter (CAT1)	P-glycoprotein (P-gp)	Transferrin receptors (TfR)
1-type large amino-acid transporter (LAT1) Excitatory amino-acid transporters (EAATs)		Leptin receptor (LepR)
Glucose transporter (GLUT1) (GLUT3)		Low-density lipoprotein receptor (LDLR)
Monocarboxylate lactate transporter (MCT1) Receptor for glycation end products (RAGE)		Neonatal Fc receptor (FcRN)
		Lactoferrin receptor (LR)