Viable and Fertile Fruit Flies in the Absence of Histone H3.3 (image) University of Zurich Share Print E-Mail Caption Drosophila wing imaginal disc: Non-stained cells, areas in black, can not modify their histone H3 at the lysin. But the cells can divide and read genes. Dark blue represents non-mutant cells, cyan represents the modification at the lysin. Credit Picture: UZH 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.