MAPT and infection: The lack of α-syn or tau propagation in the visual system upon intravitreal injection is in sharp contrast with previous PrPSc research showing successful infection of the visual system after inoculation in either the anterior eye chamber or vitreous (Fraser, 1982; Fraser and Dickinson, 1985; Kimberlin and Walker, 1986; Scott and Fraser, 1989a,b; Foster et al., 1990; Liberski et al., 1990, 2012; Scott et al., 1991, 1992; Jeffrey et al., 1995; Polanco et al., 2017).