A histochemical tracer is a compound used to reveal the location of cells and track neuronal projections. A neuronal tracer may be retrograde, anterograde, or work in both directions. A retrograde tracer is taken up in the terminal of the neuron and transported to the cell body, whereas an anterograde tracer moves away from the cell body of the neuron.
^ abKreier F, Kap YS, Mettenleiter TC, van Heijningen C, van der Vliet J, Kalsbeek A, et al. (March 2006). "Tracing from fat tissue, liver, and pancreas: a neuroanatomical framework for the role of the brain in type 2 diabetes". Endocrinology. 147 (3): 1140–1147. doi:10.1210/en.2005-0667. PMID16339209.
^Angelucci A, Clascá F, Sur M (March 1996). "Anterograde axonal tracing with the subunit B of cholera toxin: a highly sensitive immunohistochemical protocol for revealing fine axonal morphology in adult and neonatal brains". Journal of Neuroscience Methods. 65 (1): 101–112. doi:10.1016/0165-0270(95)00155-7. PMID8815303.