Female rotifer (Brachionus manjavacas) carrying eggs (IMAGE) Marine Biological Laboratory Caption A female Brachionus manjavacas rotifer, as magnified under a microscope. This rotifer is 350 µm long; about the size of a grain of sand. The hair-like cilia at the top of the individual are used for swimming and feeding. By injecting the CRISPR system components into the female’s large reproductive system, the targeted genes should be edited in the four developing eggs she is carrying at her posterior end. These eggs will hatch within a day, and the offspring will carry the edited genes. The image was taken with the polychromatic polarizing microscope, giving the normally transparent animal a colorful appearance. Credit Michael Shribak and Kristin Gribble Usage Restrictions Use with credit 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.