Table 1.

Relative frequency distribution of calcium binding proteins in adult rat perirhinal cortex

Type of CaBP Immunoreactivity	Layer of Perirhinal Cortex
	Layer I	Layer II/III	Layer V	Layer VI
CB-ir	0.2 ± 0.1 %	63.6 ± 2.6 % *	28.6 ± 2.2 % *	7.6 ± 0.5 % *
PV-ir	0.6 ± 0.1 %	25.9 ± 1.1 %	61.0 ± 1.1 %	12.5 ± 0.3 %
CR-ir	2.0 ± 0.6 % *	33.5 ± 0.8 %	52.1 ± 1.2 %	12.4 ± 2.4 %

Abbreviations: CB-ir calbindin-immunoreactive; PV-ir parvalbumin-immunoreactive; CR-ir calretinin-immunoreactive. Data were analyzed from 6 slices from each adult rat (CB n = 8; PV n = 6; CR n = 3 rats; age range 3–6 months). For each of the calcium binding proteins, data are expressed as a percentage of the total number of immunoreactive neurons for that calcium binding protein. For each layer, asterisks indicate statistically significant differences relative to the other two groups of calcium binding proteins (p < 0.005). For each individual calcium binding protein, the relative frequency of immunoreactive neurons within any layer is significantly different from the relative frequency of immunoreactive neurons in each of the other layers (p < 0.005).