An Equation to Describe the Competition Between Genes (image) California Institute of Technology Share Print E-Mail Caption The background images show cells that have been repressed to different extents. Red fluorescence corresponds to the "repressor" transcription factors that turn off the genes that produce the green fluorescent protein. The two graphs in the foreground show the level of green fluorescent protein produced as a function of the level of repressor. Credit Caltech Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.