Spatiotemporal expression of PTPRD in the developing spinal cord. Spinal cord sections from E18.5 (A,A′), P3 (B,B′), P7 (C,C′), P15 (D,D′) and P30 (E,E′) wild-type animals were subject to in situ RNA hybridization (ISH) with PTPRD riboprobes. Arrows show the PTPRD+ cells in the white matter. A′-E′, higher magnification of the ventrolateral region of A–E. Scale bars: 100 μm.