*Dear MMRRC Users: We are actively monitoring the situation with COVID-19 and remain operational. While we will do everything possible to prevent disruptions, some staff are still working remotely, and there may be delays in responding to emails and phone calls at this time. Thank you for understanding.


We are the pre-eminent public national mutant mouse repository and distribution archive in the USA, serving as a national resource of mutant mice available to the global scientific community for biomedical research..


COVID-19 is a serious public health threat and researchers around the globe are turning to mouse models as a critical tool in viral pathogenesis, vaccine, and drug treatment discovery research. To help support these efforts, the MMRRC is distributing several COVID-19 related mouse models. To learn more about the COVID-19 related list of available strains available from the MMRRC, please visit: https://www.mmrrc.org/catalog/covid_models.php

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Welcome to the Mutant Mouse Resource & Research Centers (MMRRC) Website

The MMRRC is the nation’s premier national public repository system for mutant mice. Funded by the NIH continuously since 1999, the MMRRC archives and distributes scientifically valuable spontaneous and induced mutant mouse strains and ES cell lines for use by the biomedical research community. The MMRRC consists of a national network of breeding and distribution repositories and an Informatics Coordination and Service Center located at 4 major academic centers across the nation. The MMRRC is committed to upholding the highest standards of experimental design and quality control to optimize the reproducibility of research studies using mutant mice. The MMRRC is supported by the Office of Research Infrastructure Programs (ORIP) in the Office of the Director at NIH. More than 50,000 mutant alleles are maintained as live mice, cryopreserved germplasm, and/or mutant ES cells. Live mice are supplied from a production colony, from a colony recovered from cryopreservation, or via micro-injection of ES cells. An MMRRC facility may offer cryopreserved material for resuscitation at the recipient scientist's institution.