This is the DNA source in this protocol.
Wheat germ comes from wheat seeds.
When wheat seeds are milled into white flour, the wheat germ and wheat bran are removed, leaving only starch. Wheat germ contains many nutrients while wheat bran consists of fiber. Whole wheat flour contains all parts of the wheat seed and is therefore more nutritious than white flour while also providing important fiber for digestion. Denatured enzymes and DNA unravel, loose their shape, and thus become inactive. Celsius and DNA denatures at 80 degrees Celsius.