Abraham Lincoln’s Blood for DNA Testing

DNA testing on Abraham Lincoln’s blood is still under debate when a researcher John Sotos, cardiologist and consultant for the television series House, believes that Lincoln had a rare genetic cancer syndrome before he was assassinated.
The biggest obstacle of getting approval for this DNA test is the artifact (a pillowcase strip stained with Abraham Lincoln’s blood) – how does this DNA test is performed in order to prevent any damages on the artifact?
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