A microscopic image comparing the engineered tattoo cells when exposed to normal levels of calcium (left) and elevated levels of calcium (right). This material relates to a paper that appeared in the April 18, 2018, issue of Science Translational Medicine, published by AAAS. The paper, by A. Tastanova at ETH Zurich in Basel, Switzerland, and colleagues was titled, "Synthetic biology-based cellular biomedical tattoo for detection of hypercalcemia associated with cancer."
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