As cells become differentiated, they delete the DNA for genes they no longer need.

Name: As cells become differentiated, they delete the DNA for genes they no longer need.
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As cells become differentiated, they do not delete the DNA for genes they no longer need. Instead, they selectively turn off the expression of those genes while keeping them physically present in the genome. This process allows specialized cell types to retain the potential to switch back to a less differentiated state if needed.

As Cells Become Differentiated, They Delete the DNA for Genes