Introduction: Extract Your Own Dna From Blood
things you need
sodium chloride (salt)
proteinase k (optianal)
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the first step is to get some blood and put the blood in a container then put in a little water in it (distilled water)
next add the proteinase k if you want, then add the dishwashing soap and mix
The final step is to add the rubbing alcohol (make sure the two layers don't mix) and let this sit for a few minutes and then you are done.