Simplify the following text for a Grade 13 native English-speaking person.
Original: The Nobel citation , issued by Sweden 's Karolinska Institute , said : `` This year 's Nobel Laureates have discovered a fundamental mechanism for controlling the flow of genetic information . ''
Simplified: Sweden 's Karolinska Institute chooses the Nobel Prize winners for Physiology and Medicine . They said : `` This year 's Nobel Laureates have discovered a fundamental mechanism for controlling the flow of genetic information . ''