Blood banks, risk, and autologous donation: the gift of blood to oneself -- Disentangling the embryonic gift: the UK stem cell bank -- The laws of mo(o)re: waste, biovalue, and information ecologies -- Umbilical cord blood: waste, gift, venture capital -- Commodity-communities and corporate commons -- Real-time demand: information, regeneration, and organ markets -- Conclusion: the future of tissue economies.