Dear colleagues, On behalf of the Humanized Mouse Model Working Group of the ESTP Pathology 2.0 Committee, we would like to invite you to participate in a survey aimed at pathologists working with humanized mice and genetically engineered mouse models (GEMMs). The purpose of this survey is to gather insights into current practices in animal model characterization, with a particular focus on the contributions of veterinary pathologists. All responses are anonymous. The findings will be summarized in a scientific manuscript, providing practical guidance and supporting best practices within the pathology community. If you would like to engage further with our group, you will have the opportunity to share your contact details at the end of the survey or you can contact directly via email the group lead Josep Monné (josep.monne@roche.com<mailto:josep.monne@roche.com>). We greatly appreciate your time and valuable input. Best regards, LINK TO SURVEY<https://forms.office.com/Pages/ResponsePage.aspx?id=pLpCsgKb10asY97s-KXV-In-...> On behalf of the Humanized Mouse Model Working Group ESTP Pathology 2.0 Committee