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During brain injury or infection, bone-marrow derived macrophages invade neural tissue, making it difficult to distinguish between invading macrophages and resident microglia. In addition to circulation-derived monocytes, other non-microglial central nervous system (CNS) macrophage subtypes include border-associated meningeal, perivascular and choroid plexus macrophages. Using immunofluorescent labeling, flow cytometry and Cre-dependent ribosomal immunoprecipitations, we describe\n                    <jats:italic>P2ry12-CreER<\/jats:italic>\n                    , a new tool for the genetic targeting of microglia. We use this new tool to track microglia during embryonic development and in the context of ischemic injury and neuroinflammation. Because of the specificity and robustness of microglial recombination with\n                    <jats:italic>P2ry12-CreER<\/jats:italic>\n                    , we believe that this new mouse line will be particularly useful for future studies of microglial function in development and disease.\n                  <\/jats:p>","DOI":"10.7554\/elife.54590","type":"journal-article","created":{"date-parts":[[2020,6,23]],"date-time":"2020-06-23T08:01:31Z","timestamp":1592899291000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.54590","source":"Crossref","is-referenced-by-count":172,"title":["A new genetic strategy for targeting microglia in development and disease"],"prefix":"10.7554","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5503-2830","authenticated-orcid":true,"given":"Gabriel L","family":"McKinsey","sequence":"first","affiliation":[{"name":"Department of Pediatrics, University of California San Francisco, San Francisco, United 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