Lizard tail (IMAGE) University of Southern California Caption Histology of mourning gecko blastema. Muscle is colored in white, cartilage in red, proliferating cells in green, and cell nuclei in blue. Credit USC/Lozito Lab Usage Restrictions Credit must be given to the creator. License CC BY 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.