8 / 100 Typically blood that is used for testing is injected with anti-coagulant (a substance that keeps the blood thin and prevents the platelets from sticking together). Sometimes however, blood clots (clumps of cells) are still able to form despite the attempts to prevent it. This Cellfie shows a clot toward the lower right hand corner. This sample was deemed unacceptable for testing. Through experimentation and careful analysis, these Cellfies have led to medical device breakthrough. Follow along on Twitter @CellfiesNFT and be sure to bring your lab notebook.