A team led by Prof. Song Xianjun from the Institute of Botany of the Chinese Academy of Sciences, while researching a ternary protein complex in rice nuclei that affects grain size, has shown that the transcription factor bZIP23—a protein that regulates the transcription of genetic DNA information into RNA and is part of the ternary complex—recruits the chromatin-modifying histone acetyltransferase HHC4 to specific promoters on the DNA.