UMass Chan Medical School researcher Victor R. Ambros, PhD, will share the 2024 Nobel Prize in Physiology or Medicine for his co-discovery of microRNA, the very short, single-stranded RNA molecules that are now understood to play a critical role in post-transcriptional gene regulation. The announcement was made this morning at Karolinska Institute in Stockholm, Sweden. It is the second time that a UMass Chan scientist has been recognized by the Nobel Assembly. UMass Chan Distinguished Professor Craig C. Mello, PhD, was co-recipient of the 2006 Nobel Prize in Physiology or Medicine for his discovery of RNA interference or RNAi.