Simplify the following text for a Grade 11 native English-speaking person.
Original: In summer 1951 , when she reported on her work on gene mutability in maize at the annual symposium at Cold Spring Harbor Laboratory , the paper she presented was called `` The origin and behavior of mutable loci in maize '' .
Simplified: In summer 1951 , when she reported on her work on gene mutability in maize at the annual symposium at Cold Spring Harbor Laboratory .