Biology / Bio 1335 · Atom · ~20 seconds

Gene Expression Is Regulated, Not Automatic

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A gene's presence in DNA does not guarantee its expression, since regulation at several levels can leave it silent.

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Every cell in a human body carries the same genes, yet a liver cell and a neuron express largely different sets.

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Detecting a gene in genomic sequencing does not mean its protein appears in every tissue — expression, not detection, decides that.