Graphs representing the correlations between Alpha receptor concentrations and OD of DβH-ir axons. A) and C) Representation of the values of Alpha-1 receptor concentration (A) and Alpha-2 receptor concentration (C) vs. the DβH OD. Rho value is given on each graph. B) and D) Transformation of DβH OD to logarithmic scale changes the distribution of the data to a linear pattern. E) Representation of values of total Alpha receptor concentrations vs. OD of DβH-ir axons (transformed to logarithmic scale). Blurred gray lines represent the median value in each axis. Note that after transformation, receptors and axons follow a linear correlation, and nuclei in which axon and receptor densities are not completely coincident can be identified in the graph: open diamonds represent nuclei containing high Alpha receptor densities and low DβH-ir axon densities. The open pentagon represents the Pcn nucleus, which has a high DβH-ir axon density and low Alpha receptor densities.