TABLE 1.

Altered epidermal keratinocyte proliferation in C/EBPβ-deficient mice^a

Genotype	Epidermal thickness (μm)	Nucleated cell layers	Labeling index (% S phase)
C/EBPβ+/+	13.1 ± 0.7	2.0 ± 0.2	4.2 ± 1.5
C/EBPβ−/−	21.3 ± 2.7b	3.0 ± 0.4b	7.6 ± 2.8c

^aEach value represents the mean ± standard deviation from five mice/group. 

^bValue is significantly different from corresponding wild-type value (P < 0.001) as determined by two-tailed Student’s t test. 

^cValue is significantly different from corresponding wild-type value (P < 0.05).