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The most thorough study occurred in 1970-71. Pope Paul VI permitted a series of scientific studies on the precious relics to verify their nature. Dr. Odoardo Linoli, professor of anatomy and pathological histology, chemistry and clinical microscopy, and head physician of the hospital of Arezzo, conducted the study. He was assisted by Dr. Ruggero Bertelli, professor emeritus of human anatomy at the University of Siena. The analyses were performed in accord with scientific standards and documented, and Dr. Bertelli independently corroborated Dr. Linolis findings. In 1981, using more advanced medical technology, Dr. Linoli conducted a second histological study.
The Flesh, yellow-brown in color, has the structure of the myocardium (heart wall) and the endocardium, the membrane of fibrous-elastic tissue lining all the cardiac cavities. These have the same appearance as in the human heart. No traces of preservatives were found in the elements.
The blood was also of human origin with the type AB. Proteins in the clotted Blood were normally fractioned with the same percentage ratio as those found in the sero-proteic make-up of normal, fresh human blood. The blood contained these minerals: chlorides, phosphorus, magnesium, potassium, sodium, and calcium.