Some roman catholic sources like this March 2012 US Roman Catholic Journal article This Is My Body–This Is My Blood claim there was an investigation performed about the eucharistic miracles in Lanciano (around 700) and Buenos Aires (Google search) (1996). This investigation showed that the flesh that appeared there contains identical DNA. They also point to certain Doctor Ricardo Castanon Gomez that was atheist before the tests but turned catholic later.
Is there any independent source that these tests were performed and that abovementioned doctor was really an atheist biologist that was drawn to faith by his investigation?