The scrollable table below lists neuronal pathway tracers that have been methodologically employed in experiments designed to determine the organization of neuronal connections. For each pathway tracer, its direction of transport and transport properties are indicated (in so far as these are known). A general validity rating (1-7 / lowest-highest) is assigned to each pathway tracer based on several criteria (including its uptake and transport properties, and sensitivity). For search, filter, sort, and additional functionality, use the pop-out to view the table in its own window. Refer to the document below the table for additional details and information (best viewed in pop out window).