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The 5-HT Transporter was raised to a synthetic peptide corresponding to amino acids 579-599 of rat 5HT transporter coupled to KLH. The ImmunoStar serotonin (5HT) transporter was quality control tested using standard immunohistochemical methods. The antiserum demonstrates strongly positive labeling of rat raphe nuclei, hypothalamus, cortex and spinal cord using indirect immunofluorescent and biotin/avidin-HRP techniques. Recommended primary dilutions for these methods are 1/800 - 1/1,000 in PBS/0.3% Triton X-100 - Cy3 and 1/10,000 - 1/15,000 in PBS/0.3% Triton X-100 - Biotin/avidin-HRP. By Western blot analysis using rat brain extracts of cortex, hypothalamus, midbrain, and hindbrain, the antibody specifically labels a single band. Immunolabeling is completely abolished by pre-adsorption with synthetic rat 5HT transporter (602-622).