Simplify the following text for a Grade 13 native English-speaking person.
Original: Mello and Fire 's research , conducted at the Carnegie Institution for Science ( Fire ) and the University of Massachusetts Medical School ( Mello ) , had shown that in fact RNA plays a key role in gene regulation .
Simplified: Mello and Fires research , at the Carnegie Institution for Science ( Fire ) and the University of Massachusetts Medical School ( Mello ) , had shown that RNA is very important in gene control .