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[摘要]:Cells acquire their fate in vivo in the context of a complex microenvironmental "niche" comprised of heterologous cell types, signaling molecules, extracellular matrix, biophysical forces, and metabolic substrates. Now Calderon and Boehm report the "refunctionalization" of a defective thymic epithelial niche, offering insights into how signaling molecules may be hierarchically organized to direct differentiation outcomes. |
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