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Well, when they take DNA samples, it's usually a cheek swab. You can take a cotton swab or a toothpick and gently scrape the inside of your cheek. You'll get some nice skin cells on the swab. It'll be next to nothing compared to the peas, though. Blood would work, but I don't know how many blood cells you would get after separating them from the serum.
You could try a chunk of fresh (meaning: not frozen) meat. That would give you plenty of cells. I say unfrozen because the ice crystals would puncture the cells and possibly puncture the DNA as well.
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