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The Section on Cellular and Developmental Biology, led by Paul Love, studies mammalian hematopoietic development. A main area of research concerns T lymphocyte development, particularly signal transduction molecules and pathways that regulate T cell maturation in the thymus. The group revealed a critical function for T cell antigen receptor (TCR) signaling in controlling key developmental events essential for the prevention of autoimmunity and recently described a previously unknown T cell–specific protein, Themis, which functions to sustain TCR signaling during T cell development. Additional studies identified an essential function for the nuclear adapter LIM domain protein-1 in hematopoietic stem cell maintenance and erythropoiesis.