C. elegans H3.3 to H3 (IMAGE) Johns Hopkins University Caption A video clip shows cellular changes in the roundworm from a histone H3 variant in red to an H3-rich genome in green. Credit Ryan J. Gleason, Johns Hopkins University. Usage Restrictions none License Original content 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.