CAMP and infection: In humans, there is only one cathelicidin gene (CAMP) expressed as an 18 kDa precursor pro-protein called hCAP18, which is subsequently cleaved to the well-characterized cationic peptide LL-37, which is expressed constitutively or induced by the presence of infections and/or inflammatory stimuli in immune and structural cells (9), highlighting an important role of 1,25-dihydroxy vitamin D3 in the induction of this peptide (18).