On Monday, two American scientists, Andrew Z. Fire and Craig C. Mello won the 2006 Nobel Prize in physiology or medicine for discovering a fundamental mechanism in controlling the activity of genes.

The Nobel Assembly of Stockholm's Karolinska Institute said on Monday that the two won the prestigious award for their research into gene silencing by double-stranded RNA.

Reuters reports that the two scientists discovered a fundamental mechanism for controlling the flow of genetic information. The winners will be awarded a 10 million Swedish crown ($1.37 million) prize.

The medicine award series will be followed by this year's other series of prize announcements, namely prizes for physics, chemistry, literature, peace and economics.