Visualization of the canonical correspondence analysis (CCA) results of neuronal subtypes across different brain regions under six growth stages. Assuming that both cell types and regions have unit variance, their projections on the plane reside within a circle of radius one centered at the origin. Distance to the center refers to the strength of the relationship. The first group (colored in red) consists of eight excitatory neuronal subtypes. The second group (blue) consists of eight inhibitory neuronal subtypes. The third group (magenta) consists of 11 brain regions on cerebral cortex hemispheres. For clarity, two circles with radii of 0.5 and 0.75 are shown to distinguish associations of cell types and regions. CCA results revealed a number of neuronal subtypes in close proximity to specific regions at six different temporal stages: (A–C) early, intermediate, and late prenatal stage; (D–F) early, intermediate, and post-postnatal stage.