Cells and DNA does not last long if not preserved somehow. So you would not expect there to be any remaining cells from Jesus left. The blood stains are just the leftover minerals from the blood. The red hemoglobin in our blood oxidizes into iron oxide which happens to also be red, although a different shade.
However that being said when they did sample Jesus’s burial cloth they discovered that it was from the renaissance and could not have been older. So it is not the real burial cloth but a forgery made centuries after his death.
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