mRNA degradation.
<P>
<lI> Single-stranded   microRNAs   (miRNAs)  can  form  double-stranded
regions by hydrogen bonding.
<lI> The  single-stranded loops are cut by the Dicer, and one strand is
degraded.
<P>
   The  remaining  miRNA  strand  forms  a complex with proteins, and can
   degrade complementary mRNA or block its translation.