Image of Developing Human Thymus Gland (IMAGE) Wellcome Trust Sanger Institute Caption A first cell atlas of the human thymus gland has mapped thymus tissue through the human lifespan to understand how it develops and makes vital immune cells called T cells. Here is a section through a developing human thymus. The scale bar represents 1 mm. Credit Kenny Roberts, Bayraktar lab: Wellcome Sanger Institute Usage Restrictions None License Licensed 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.