The RAG transposon is active through the deuterostome evolution and domesticated in jawed vertebrates.

RAG1 and RAG2 are essential subunits of the V(D)J recombinase required for the generation of the variability of antibodies and T cell receptors in jawed vertebrates. It was demonstrated that the amphioxus homologue of RAG1-RAG2 is encoded in an active transposon, belonging to the transposase DDE superfamily. The data provided support the possibility that the RAG transposon has been active through the deuterostome evolution and is still active in several lineages.

[Prescription of diphosphonates in ambulatory oncology. A study of the health insurance medical services].

Objectives: As requested by the Health Ministry, the Agricultural (Mutualité Sociale Agricole) and Independant Professions (Assurance Maladie des Professions Indépendantes) Health Insurances carried out a survey to analyse the use of second generation oral biphosphonates.

Methods: The data, from 3,414 prescriptions, gathered over the twelve months from May '93, showed that clodronate is prescribed mainly for breast cancer (35%), prostate cancer (23%), multiple myeloma (19%) and carcinoma of the lung (7%). The other prescriptions (16%) were either related to various malignant diseases (18 types encountered) or non-malignant diseases (mainly osteoporosis, but also Paget's disease of bone and hyperparathyroidism).