Figure 1: Naive T cells are present in infant and adult but not in neonatal epidermis. Cryosections from neonatal (3 days), infant (5 months) and adult (31 years) foreskin were labeled with anti-CD3-FITC and anti-CD45RA-PE mAbs. Arrows indicate CD3+CD45RA+ cells in the epidermis. Shown is one representative experiment out of 10. Scale bars: 5 μm. E = Epidermis, D = Dermis.