- HIV-1 Tat alters normal organization of neurons and astrocytes in primary rodent brain cell cultures: RGD sequence dependence. Kolson, D.L., Buchhalter, J., Collman, R., Hellmig, B., Farrell, C.F., Debouck, C., Gonzalez-Scarano, F. AIDS Res. Hum. Retroviruses (1993)