Hospital Clinico Universitario de Valencia 1 article published in JoVE Biology Noninvasive Monitoring of Lesion Size in a Heterologous Mouse Model of Endometriosis Jessica Martinez1, Viviana Bisbal2, Nerea Marin2, Antonio Cano1,3,4, Raul Gómez1 1Instituto de Investigación Sanitaria, 2Unidad de Animalario del Centro de Investigación Príncipe Felipe (CIPF), 3Departamento de Pediatría, Obstetricia y Ginecología, Universidad de Valencia, 4Servicio de Obstetricia y Ginecología, Hospital Clínico Universitario de Valencia Here, we present a protocol for live-imaging of fluorescently labeled human endometrial fragments grafted in mice. The method allows studying the effects of drugs of choice on endometriotic lesion size through monitoring and quantification of fluorescence emitted by the fluorescent reporter on real time