The legislative power organizes two types of banks: those preserving essentially for themselves and those ensuring the availability of preserved elements. In both cases, they must be supplied. The first sections focus on the modalities governing how banks or collectors request resources for scientific research and the access conditions to different types of elements and human body products. This “moment of patrimonialization” i.e. the moment when the person from whom elements are derived can no longer claim any right, depends on the process the elements’ extraction, either swabbed or removed, from deceased or living persons. This review shall analyze the rights and duties of banks in respect of the use of these elements after they have been detached and preserved for scientific purposes.