Comparing dizygotic twins and parental age–matched unrelated children (PAMUCs). (A) Number of DNMs in dizygotic twins in relation to age of the father. Twins are linked by lines. (B) Number of DNMs in parental age–matched unrelated children (PAMUCs) in relation to age of the father. (C) Absolute differences in the number of DNMs between twins and PAMUCs. Numbers indicate sizes of sets, boxes indicate interquartile range, and bold line indicates median.