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Segments. they don't actually code for any physical characteristic or any kind of molecule inside your body that's doing a job. they are just repetitive, noncoding regions of dna. and i can take advantage of that fact. the fact that those repetitive sequences vary from individual to individual. so i can use these short segments of dna to develop a profile for that individual. >> and if you could i'd like you to break down in terms of the str process, are there, i think, three or four steps that you have to go through in order to first determine whether you have enough dna to actually develop i...

Physical characteristic or molecule inside your body doing a job, they are just repetitive non-coding regions of dna. i can take advantage of that fact, the fact that those repetitive sequences vary from individual to individual. i can use these short segments of dna to develop a profile for that individual. >> if you could, i'd like you to break down, in terms of the str process, are there three or four steps you have to go through in order to first determine whether you have enough dna to develop it? >> yes. the first step would be analyzing the item of evidence for the possible bodily fluid...