TREM2 and Alzheimer disease: Interestingly, our recent study has revealed that Triggering Receptor Expressed on Myeloid cells 2 (TREM2), a microglial innate immune receptor that has been linked to increased AD risks, can interact with CSF1R, which surprisingly is not necessary for CSF1/CSF1R-mediated microglial survival (Cheng et al., 2021).