The statement 'Skin cells and epithelial cells each make a different set of proteins, which determines each cell type's structure and function.' is correct. It is known as differentiation.
Differentiation refers to the cellular phenomenon for which different genes are expressed in specific cell types.
Differentiation leads to the formation of different cell types that have specific functions/roles.
Differentiation depends on gene expression pattern that influences the type and amount of proteins in a given cell.
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