Tissue Economies: Blood, Organs, and Cell Lines in Late CapitalismAs new medical technologies are developed, more and more human tissues such as skin, bones, heart valves, embryos, and stem cell lines are stored and distributed for therapeutic and research purposes. The accelerating circulation of human tissue fragments raises profound social and ethical concerns related to who donates or sells bodily tissue, who receives it, and who profits or does not from the transaction. Catherine Waldby and Robert Mitchell