This was consistent with our flow cytometry data showing higher percentages of CD45+ lymphocytes in IP tissue compared with NU tissue, as shown on Figure 2D. Immunohistochemical analysis of NU tissue confirmed the presence of SDF-1, VEGF, and BMP-2 and their localisation to blood vessels (Figure 3C); this was consistent with our previous findings in IP tissue [38]. This evidence concerns the gene PTPRC and incontinentia pigmenti.