Overexpressing cyclin D1 alone through AAV7m8-GFAP-cyclin D1 infection stimulated a subset of MG cells to proliferate, resulting in a threefold increase in the number of EdU+ MG cells compared to p27Kip1 knockdown (Figure 1E and G, Figure 1—figure supplement 3). The gene discussed is CDKN1B; the disease is infection.