As neonatologist and basic scientist, Tim Sanders both provides care for vulnerable infants and studies some of the most fundamental elements of life.
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The DNA of an animal contains the instructions for creating every type of cell in its body. During development, the generation of different cell types (e.g., neurons, blood cells, muscle cells) depends on different sets of genes for each cell type to be expressed at the right time. But what determines which genes are switched on and which genes are turned off or ignored?
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