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During embryonic development, proteins called Polycomb group complexes turn genes off when and where their activity must not be present, preventing specialised tissues and organs from forming in the wrong places. They also play an important role in processes like stem cell differentiation and cancer. In a study published online today in Nature, scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, identified a new Polycomb group complex, and were surprised by how it acts...

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