r than a quantitative effect on these phenotypes in vivo.
In contrast, the level of XPCS mRNA expression did affect the ability of the encoded protein (XPDG602D) to restore the TTD hair phenotype to normal. Notably, XpdTTD/ †XPCS animals had a partial TTD hair phenotype, correlating with low levels of Xpd†XPCS expression, whereas XpdTTD/XPCS animals had wt hair, correlating