Table 2.

Summary of the main changes in expression of PV and PNN in A1 of C57 and CBA mice.

Analysis type	C57 Young → Old	CBA Young → Old
PNN+ cell density	Decrease	Decrease
PV+ cell density	Decrease	No change
PV/PNN co-localized cell density	Decrease	Decrease
Average PNN intensity across layers	Decrease	No change
Average PNN cellular intensity	Decrease	No change

Comparisons are only shown for all layers of A1 and only between young and old mice. Layer-specific changes and middle-aged data are omitted for clarity and can be found in the “Results” Section.