CD34 and systemic lupus erythematosus: Human SLE or Healthy 2.5 × 105 CD34+ progenitors were injected into each of fourteen 2–3 month-old NBSGW mice (one human sample per mouse, 7 inoculated with SLE-derived and 7 with Healthy-derived PB CD34+ HSPCs, Figs. 4 and 5A).