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Gene Expression refers to the process by which information encoded in a gene is used to synthesize a functional gene product, such as a protein or RNA molecule. In the context of cellular differentiation, gene expression plays a crucial role in determining the unique characteristics and functions of different cell types. Epigenetic modifications, including DNA methylation and histone modification, can influence gene expression patterns and contribute to the stable inheritance of cell-type specific phenotypes. Through the regulation of gene expression, cells are able to respond to environmental cues and undergo differentiation, ultimately giving rise to the diverse array of specialized cell types that make up complex organisms.