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Just read the link above. There are limitations with the method they used to analyze the clots, to say the least. "Samples are "digested" into nitric acid, this acid is nebulized into a liquid stream which goes through a plasma torch, gets ionized and then directed through a quadrupole assembly that sorts the elements by their mass-to-charge ratios". It is true that metal elements entrapped int the clot can still be detected by MS. However, such sample preparation has already destroyed any proteins presence, to the point beyond recognition! It is because even the basic building blocks (i.e. amino acids) of the proteins have already been chemically destructed. In other words, the choice of this methodology itself already eliminated the possibility that the clot is mostly made up of proteins! To put it into an analogy: it is like you burn up the dead body into ash first before you do the autopsy!