- Microglia and Non-CNS Cells in Paracrine Signaling and CNS Immunity: Effects of Pathogens, Age, and Life History

Activation States ................................................................246 9.3 Astrocytes as Active Regulators of CNS Immunity ± Neurons ................... 247

9.3.1 Chemokines and Leukocyte Entry into the CNS ............................. 247 9.3.2 Leukocyte Migration into and within the CNS ................................248 9.3.3 Microglial and Macrophage Activation: trem2 and tmem176b ........250