Diffusion Concentrates Cell Differentiation Signals in Drosophila Embryos (image) North Carolina State University Share Print E-Mail Caption Diffusion causes the signal (Dorsal proteins; green) to concentrate on the ventral (lower) side of the embryo over time. Left side: Cross section of young embryo, 1-1.5 hrs old, with uniform amounts of Dorsal protein spread throughout the embryo. Right side: Cross section of older embryo, 2.5 hrs old, with Dorsal protein concentrated on the ventral (lower) side. Credit Greg Reeves, North Carolina State University Usage Restrictions Image credit must be given. 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.