Amino-acid sequence alignment of selected mammalian cathelicidin precursors. Equine cathelicidins are shown in bold letters. Conserved amino-acid residues are highlighted in grey. Mature peptides are underlined. The peptide structure of the mature peptides is given at the end of each sequence. The signal peptide (light grey) and the cathelin domain (dark grey) are indicated by lines on top of the sequence block. Species abbreviations: [ECA] = Equus caballus, [SSC] = Sus scrofa, [BTA] = Bos taurus, [HSA] = Homo sapiens, [OCU] = Oryctolagus cuniculus, [MMU] = Mus musculus.