Figure 1. Ligand uptake into human embryonic kidney (HEK) norepinephrine (NET), dopamine (DAT), and serotonin (SERT) transporter cells and HEK cells (control). The cells were incubated with transport buffers containing 192.4 nM³H-norepinephrine, 67.2 nM³H-dopamine, or 76.1 nM³H-serotonin. Uptake was determined after 6 min. Each point represents the mean +/- SD of two experiments preformed in quadruplicate. *P < 0.01.