Fig. 4

Levels of Cer subclasses and the Cer [NP]/[NS] ratio in the SC and in KCs. Levels of (a) total Cer, (b) each Cer subclass, and (c) the Cer [NP]/[NS] ratio in the SC and in KCs from normal human skin. Open and black bars indicate SC and KCs, respectively. ■ represents the back skin from a 65-year old female. ◆ represents the thigh skin from a 78-year old male. △ represents an unknown skin site from a 52-year old male. All bars show means ± SD. N = 3. Statistical significance determined by Student’s t-test (* p < 0.05)