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As part of the field of research of so-called “infrastructure studies” established by the science and technology sociologist Susan Leigh Star, this paper proposes to penetrate behind the scenes of a specific infrastructure, a hospital-based biobank, and to follow step by step the work of its operational agents, medical assistants, and laboratory technicians. In doing so, and as a first step, it aims to challenge the notion of care as theorized by the philosopher Maria Puig de la Bellacasa, following the work of Bruno Latour and his notion of “matters of concern” (1). The specificity of this notion (care) is to question our responsibility for the future of the “thing” we study (which is also the “thing” we construct and inhabit). This paper thus proposes to establish, in a second step, an alternative “style” of investigating and reporting (alternative in that it is an alteration of the classical model), which aims to convey care that is symmetrical to that expressed by its informants (2).