Interesting addition to the toolbox, if you're working on #microglia:

"We generated a constitutive Cre line controlled by the microglia signature gene Crybb1 that produced nearly complete recombination in embryonic brain macrophages (microglia and border-associated macrophages [BAMs]) by the perinatal period, with limited recombination in peripheral myeloid cells."

https://www.cell.com/immunity/fulltext/S1074-7613(23)00040-7