内在 ないざい せいレトロウイルスだったら
nai zaiseiretorōirusudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 内在性レトロウイルス

1. If it were an endogenous retrovirus; If it was an endogenous retrovirus

Tara Conditional
Biochemistry