There was a significant negative correlation between Pgp1 expression and Calcein-AM uptake by T (R = .893, p = .012) (Figure 5), NKT-like (R = .901, p = .008) and NK cells (R = .915, p = .004) from a cohort of 6 COPD patients and 6 control subjects. The gene discussed is CD44; the disease is chronic obstructive pulmonary disease.