Dicer is an endoribonuclease which has two RNase III domains and one PAZ domain and belongs to the highly conserved family of dsRNA-specific endoribonucleases RNase III family. Dicer plays important roles in RNA processing, post-transcriptional gene expression control and defense against viral infection. Synthesis of proteins can be blocked by RNA in a process known as RNA interference and for this process to happen; three important events have to occur. First, DICER processes dsRNA into smaller fragments known as short interfering RNAs (siRNAs) and microRNAs (miRNAs). Second, a dsRNA binding protein recruits a DICER-siRNA complex to Argonaute2 (Ago2), which is an endonuclease capable of degrading messenger RNA (mRNA). Third, Dicer facilitates the formation of a large multiprotein complex called RISC (RNA-Induced Silencing Complex). RISC can seek out and capture messenger RNA (mRNA) molecules with a base sequence complementary to that of its siRNA or miRNA. This serves to either destroy the genetic message carried by the mRNA outright or else block the subsequent synthesis of a protein.