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DNA carries instructions for making the proteins a cell needs. DNA molecules are found in chromosomes. Genes are segments of DNA that contain instructions that code for proteins.
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How can DNA be used to help solve a crime?
DNA can help solve a crime because each person’s DNA is unique. Scientists analyze variable regions to create a DNA profile from samples such as blood, bone, hair, or other body tissues and products. A crime-scene DNA profile can be compared with a suspect’s DNA, and DNA typing can also help solve old cases.
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