KLA peptide acetate is a naturally occurring Antibiotic peptide that is nontoxic outside of cells but is toxic when it enters into the interior of targeted cells. KLA peptide acetate can induce cell Apoptosis by disrupting mitochondrial membranes and activating Caspase. MG1-KLA acetate, formed by the coupling of KLA peptide acetate with MG1, can selectively induce apoptosis in pro-inflammatory microglia. KLA peptide acetate can be used for the research of liver fibrosis. KLA peptide acetate can be used for the research of neonatal hypoxic-ischemic encephalopathy[1][2].