Citrullinated LL-37 2cit is a citrullinated LL-37 peptide. Citrullinated LL-37 2cit reduces LL-37 activity against HRV at 10 μg/mL and reduces the antibacterial effect of LL-37. Citrullinated LL-37 2cit causes a reduction in the levels of IL-8 , CCL5, and IL-6 mRNA induced by RV1B. Citrullinated LL-37 2cit shows a moderate loss in the ability to reduce HRV-induced CCL5 secretion.