Blood Cells from the Crayfish (image) Cell Press Share Print E-Mail Caption Blood cells were labeled with BrdU (green nuclear label) while in S phase of the cell cycle, and then harvested and labeled with the nuclear label Hoechst 33342 (cyan label) to reveal nuclei in all cells. Blood samples such as these were injected into recipient crayfish, and the labeled cells were then tracked to the stem cell niche. Credit Jeanne Benton Usage Restrictions Credit Required 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.