Genes are regions of DNA which is found in the nucleus of a cell. DNA is made up of bases (A, C, T and G), the order of these change to make a gene. This gene is expressed when RNA is produced and results into a protein. Proteins are produced outside of the nucleus in the cytoplasm of the cell. This website has a really nice diagram to summarise this: https://www.nature.com/scitable/topicpage/gene-expression-14121669
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