Where is the DNA extracted from the sample that I sent?

If the sample that you have sent us is blood, the DNA will be extracted from the interior of the red blood cells that make up the blood sample. If you have sent us feathers, the DNA will be extracted mainly from a small blood clot that remains dry and isolated inside the barrel where the feather´s beard begins (also called "upper navel"). DNA will also be extracted from the epithelial cells that remain in the portion of the feather tube that is inserted into the body of the bird (also called "lower navel"). However, in relative terms, it will be from the upper navel that the higher concentration of DNA will be extracted.