[In heretability of functional properties of the skin]

The sum of the skin surface lipids, the alkali neutralization time and the alkali resistance of the skin were determined in 15 uniovular and 26 binovular pairs of twins. The mean difference between both twins were evaluated. These were then correlated with the average absolute values. A genetical regulation of the investigated factor can be assumed when the relative mean differences were significantly smaller in the uniovular twins than in the binovular twins. An influence of genetical factors could be demonstrated for the above three parameters. From the results it is assumed that the influence of genetical factors is also of quantitative importance.