Twin copies of gene pair up in embryonic stem cells at critical moment in differentiation

Both copies of the Oct4 gene physically come together just as embryonic stem cells begin to develop into tissue-specific cell types IMAGE: We and other mammals have two copies of each gene, and each copy, or 'allele,' was thought to remain physically apart from the other in the cell nucleus. David Spector's... view more Cold Spring Harbor, NY -- Imagine a pair of twins that everyone believed to be estranged, who turn out to be closer than anyone knew.

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