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Department of Biological Sciences, Imperial College London, London, United Kingdom
The Hedgehog family of secreted intercellular signaling molecules are regulators of patterning and organogenesis during animal development. In this study we provide genetic evidence that Sonic Hedgehog (Shh) has a role in the control of murine T cell development. Analysis of Shh-/- mouse embryos revealed that Shh regulates fetal thymus cellularity and thymocyte differentiation. Shh is necessary for expansion of CD4-CD8- double-negative (DN) thymocytes and for efficient transition from the earliest CD44+CD25- DN population to the subsequent CD44+CD25+ DN population and from DN to CD4+CD8+ double-positive cells.
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