PW MedEd on Instagram: "Scientists used CRISPR‑Cas9 to precisely cut out HIV‑1 proviral DNA from human immune (CD4+ T) cells. After editing, these cells were re‑exposed to HIV and showed no reinfection, meaning the virus did not re‑establish itself. The technique permanently inactivated viral replication by introducing mutations into the HIV DNA. Importantly, the CRISPR treatment had no toxic effects on the human immune cells in the lab. This work was done in vitro (in cell cultures) using T cel