About the Authors
State Key Laboratory of Biocontrol, Key Laboratory of Gene Engineering of the Ministry of Education, Sun Yat-sen University, Guangzhou, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JYL HZ LHQ. Performed the experiments: JYL LMM YHG YCZ. Analyzed the data: JYL YCZ PS LHQ. Contributed reagents/materials/analysis tools: HZ YQC LHQ. Wrote the paper: JYL HZ PS YQC LHQ.