Nuclear localization of CD26/DPPIV. (A and B) Immuno-electron microscopy in (A) Karpas 299 cells (scale bar: 200 nm) and (B) JMN cells (scale bar: 1 μm). (C and D) The activity of DPPIV. J/Wt, J/CD26 or Karpas 299 cells were measured in (C) nuclear and (D) cytosolic fractions. Data are the means ± s.d. for each representative experiment, which was performed in triplicate.