(A–C and G–I) Visualization of sensory afferent projections (green) into the spinal cord of wild-type (A–C) and TauEWS-Pea3/+ Isl1Cre/+ (G–I) embryos at E13.5 (A, C, G, and I) and E16.5 (B and H) by Cre-recombinase-mediated activation of mGFP expression from the Tau locus (A, B, G, and H) or by a Thy1spGFP transgene (C and I; [25]). Grey arrows indicate normal pattern of afferent projections into the spinal cord, whereas red arrows show aberrant accumulation of sensory afferents at the lateral edge of the spinal cord in TauEWS-Pea3/+ Isl1Cre/+ embryos.