Fig. 6From: Ancient human miRNAs are more likely to have broad functions and disease associations than young miRNAsOld miRNAs are expressed in more tissues than young miRNAs. miRNA age is significantly correlated with the number of tissues in which it is expressed (Spearman’s ρ = 0.51, P = 8.8e–52). Stratifying miRNAs older and younger than 100 MY revealed that old miRNAs are expressed in significantly more tissues (P = 8.8e–27; Mann-Whitney U test). Old miRNAs also show less variation in the number of tissues in which they are expressedBack to article page