Thymus cells (IMAGE) Walter and Eliza Hall Institute Caption Reminiscent of a Halloween pumpkin, this collection of dots shows cells forming part of the thymus. Credit: WEHI Credit WEHI Usage Restrictions Free to share, must 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.