SLC6A4 and Lewy body dementia: The combined DAT and 5HTT ligand 123I-N-ω-fluoropropyl-2βcarbomethoxy-3β-(4-iodophenyl) nortropane (123I-FP-CIT) has been used in DLB where the assumption is that cortical retention only represents 5HT innervation despite DA terminals being present.