RNA interference controls the behavior of a cell by "silencing" or turning off specific genes. When treating cancer with gene therapy, the challenge is to develop a delivery system (a "vector") for injecting the RNA silencing instruction (RNAi) into the tumor cell. One method for doing this is by infecting the patient with a virus that contains RNA (a "retrovirus") instead of DNA. This method remains experimental.

In this case, though, Kamilla is describing how the homo lamia virus actually works.

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