LightSpot® fluorescent tracers directly detect and quantify the MultiDrug Resistance protein “P-gp”. They make it possible to identify an increase in P-gp expression following treatment in tumor samples (biopsies, artificial tumors, cancerous cell lines, etc.). We are also developing the use of these tracers for the detection of aquatic pollution by sampling fish blood, following the Sentinelles patent, licensed by the company BIORMARQUEURS.