Microglial cell line (SIM-A9) expresses macrophage/microglia specific proteins, CD68 and Iba1.Microglia cells share functional similarities with macrophages, and are thought to act as the primary immune cells of the central nervous system (CNS). They monitor their microenviornment and become activated upon detection of abnormal and/or offensive signals. Activated microglia have been found in inflammatory conditions such as brain/spinal cord injury, ischemic strokes, infections and neurodegenerative diseases. Recent findings indicate that microglia are also involved in learning and memory by regulating synaptic plasticity.