What is cellular differentiation primarily associated with?

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Cellular differentiation refers to the process by which a less specialized cell becomes a more specialized cell type, acquiring distinct structural and functional characteristics. This is crucial during development, as it allows for the formation of various tissues and organs from a single fertilized egg.

The process often involves changes in gene expression, where specific genes are turned on or off, leading to the production of proteins that are characteristic of that particular cell type. For instance, stem cells can differentiate into muscle cells, nerve cells, or skin cells, each with specific functions and properties.

The other options do not accurately describe cellular differentiation. Dividing into two identical cells represents mitosis rather than differentiation, while aging refers to biological processes unrelated to cell specialization. Remaining unchanged throughout life contradicts the very essence of differentiation, which inherently involves change and specialization of cellular function.

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