Jacques Miller established a central role of the thymus in the development of immunity. In his firsthand account, removing the thymus from newborn mice led to a deficiency of lymphocytes and failure to reject skin grafts. The contrast with removal in adult mice helped reveal a developmental function that adult experiments had obscured.[ref]
Professor Jacques Miller, pathologist in Conversations with Australian scientists. Why did the mice waste away? An unexpected finding: lymphocyte deficiency, graft acceptance and the 1961 report.
A further comparison separated two consequences of the intervention. In conditions excluding environmental microorganisms, the mice remained healthy but still failed to reject skin grafts. Thus wasting illness and impaired immune responses were not interchangeable observations: illness depended on exposure, while the graft test still revealed the immune defect. Miller's experiments helped replace the idea of the thymus as a largely inactive organ with a developmental explanation for immunological competence.[ref]
Professor Jacques Miller, pathologist in Conversations with Australian scientists. So why did the mice waste away?: germ-free comparison.
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Jacques Miller is an Australian immunologist renowned for his pioneering research in the field of immunology, particularly for his work on the role of the thymus gland in the development of T cells (a type of white blood cell essential for the adaptive immune response). He is best known for discovering the importance of the thymus in the maturation of T lymphocytes, leading to significant advancements in understanding the immune system.