Fig. 2.

(a) The redox ratio value of frozen-thawed (F) hamster epithelium is significantly reduced from the in vivo (IV) value, while live tissue culture maintains redox ratio values similar to in vivo measures over the 4 h of live culture measurement ($\text{mean}\pm \mathrm{SE}$ of $n=10$ measurements). (b) The redox ratios of the spinosum and basal epithelial layers of the live-culture biopsies over 48 h ($\text{mean}\pm \mathrm{SE}$ of $n=6$). Asterisk denotes significant difference between in vivo and the indicated measurement ($*p<0.05$; $**p<0.01$).