LL 37 (human) biotinylated, pegylated is the N-terminally biotinylated version of the host defence peptide LL 37 with a biotin group attached via a pegylated chain, PEG(4). The presence of the biotin tag allows numerous biochemical and microbiological applications. LL 37, derived from the C-terminal of human cathelicidin antimicrobial peptide (CAMP, hCAP18), has antimicrobial, antitumour, antiviral and immunomodulatory properties and also has physiological functions in chemotaxis, promotion of wound closure, and angiogenesis.