I am all in favor of subjecting purported Eucharistic "miracles" to the most rigorous scientific testing, and to add credibility, done by scientists who are absolutely hostile to the idea that these may, indeed, be miracles.
Then, if repeated scientific analysis of this matter, performed upon different species in different locations, separated by time and space, turns up the very same DNA, with characteristics that indicate it is from the heart muscle tissue of a man, who died in a traumatic fashion, with haplotypes that indicate Middle Eastern Semitic origin, and possibly even no human father, well, then, that gives everyone something to consider.