Schematic of 123I-MIBG used as a tracer

Schematic of ¹²³I-MIBG used as a tracer for assessing presynaptic uptake-1 transport function (βAR, β-adrenergic receptor; α1AR, α1 adrenergic receptor; COMT, catechol-O-methyltransferase; MAO, monoamine oxidase; NE, norepinephrine).