sentence: After viral membrane fusion to enter the target cell , the core protects the viral genome from host sensor proteins such as cGAS , serves as location for reverse transcription , and traffics the pre-integration complex as far as the integration site ( Forshey et al ., 2002 ; Gao et al ., 2013 ; Rankovic et al ., 2017 ; Novikova et al ., 2019 ; Siddiqui et al ., 2019 ; Burdick et al ., 2020 ) .