Localization of MOD/YF17D RNA in the brain of SCID mice at the time of paralysis (15 days postinfection by the intraperitoneal route) by in situ hybridization with a MOD-specific probe. Neurons in the temporal cortex (A [magnification, ×40] and B [magnification, ×10]) and in the hippocampus (C [magnification, ×2.5]), and Purkinje cells in the cerebellum (D [magnification, ×10]).