An illustration demonstrating 'Blocking of gene expression in mRNA' has 3 stages:

1. Stage 1. Dicer enzyme breaking large RNA molecule to smaller miRNA molecules.
2. Stage 2. A silencing complex attached to mRNA strand resulting in a Complementary base sequence to miRNA.
3. Stage 3. A chopped mRNA strand with miRNA strand attached to silencer complex prevents translation into protein.

The following are also marked on the illustration:

• Dicer enzyme
• larger RNA molecule
• miRNA
• Silencing complex
• mRNA
• Complementary base sequence to miRNA
• No translation
• Chapped mRNA
• No protein