In a double-blind RCT carried out by Fuentes-Orozco et al. [81] for 10 days, on 33 patients with secondary peritonitis, supplemented with 0.26 g/kg/day Gln, it was also suggested an increase in T-cells levels, including, their subpopulations, CD4 and CD8. The gene discussed is CD4; the disease is peritonitis.