E Pluribus Unum: 3' end formation of polyadenylated mRNAs, histone mRNAs, and U snRNAs.

The 3' ends of almost all eukaryotic RNAs are generated by nucleolytic cleavage. Remarkably, three groups now demonstrate that similar or identical endonucleases of the metallo-beta-lactamase family generate the 3' ends of polyadenylated mRNAs, nonpolyadenylated histone mRNAs, and U snRNAs.