Objective To investigate the effect of different apolipoprotein E( APOE = gene,apo E =protein) genotypes on the neuroprotective function of apo E mimetic peptide( COG1410) after early traumatic brain injury( TBI). Methods APOE targeted-replacement mice( ε3,ε4) and APOE knockout( APOE(-/-) mice were randomly allocated to a TBI + COG1410 group( n = 30),a TBI + normal saline group( n =30) and a sham operation group( n = 10). The TBI + COG1410 group and the TBI + normal saline group each were further divided in...