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Codons are sequences of three DNA or RNA nucleotides that correspond with a specific amino acid or stop signal during protein synthesis. They are found within the genetic code of all organisms, from bacteria to humans.In DNA, codons are located within the genes, which are specific regions of DNA that carry the information necessary for the synthesis of proteins. Genes are made up of exons and introns. Exons are the segments of the gene that contain the codons and are transcribed into mRNA, while introns are non-coding regions that are removed during the process of splicing.During transcription, the DNA double helix unwinds and one strand acts as a template for the synthesis of a complementary RNA molecule. This RNA molecule, called the pre-mRNA, is then edited through the process of splicing, where the introns are removed and exons are joined together, forming a mature mRNA molecule. This mRNA molecule carries the genetic information from the DNA out of the nucleus and into the cytoplasm where it is translated by ribosomes into a specific amino acid sequence, or a protein.In translation, the mRNA is read in groups of three nucleotides, called codons, by transfer RNAs (tRNAs) that carry specific amino acids. Each tRNA carries an amino acid that corresponds to a specific codon and the sequence of tRNAs that bind to the mRNA determine the sequence of amino acids in the resulting protein.In summary, codons are found within the genetic code of DNA and RNA, specifically within the exons of genes. They are transcribed into mRNA and translated by ribosomes during protein synthesis, specifying the sequence of amino acids that make up a protein. They play a crucial role in the process of gene expression, allowing the genetic information in DNA to be converted into functional proteins that carry out the various functions in cells.