Anti-microbial peptide cathelicidin (LL-37) in critically ill subjects with sepsis, critically ill subjects without sepsis and healthy subjects. Plasma LL-37 levels were significantly lower in the two critical ill groups (with sepsis, hatched bar and without sepsis, dark bar) compared to the healthy controls subjects (white bar) (ANOVA, p= 0.002). There was no statistically significant difference between LL-37 levels in the two critically ill groups. ‡ p < 0.001, critically ill sepsis subjects compared to healthy controls. # p < 0.001, critically ill control subjects compared to healthy controls.