(A) The DEFA1 cDNA sequence is depicted in lower case letters, with the amino acid sequence in upper case letters. The sequence (nucleotides and amino acids) of the mature peptide is depicted in bold, and the start codon is underlined. (B) Comparison of the DEFA1 amino acid sequence with the amino acid sequences of equine [ECA (Equus caballus)] DEFA5L, human [HSA (Homo sapiens)] α-defensins DEFA5, DEFA6 and HNP-3, chimpanzee [PTR (Pan troglodytes)] DEFA5, rat [RNO (Rattus norwegicus)] DEFA5, NP-3 and defensin 6, and rhesus macaque [MMU (Macaca mulatta)] α-defensin 5. The boxes indicate highly conserved residues among the primary translation products of equine defensin and the other α-defensin genes. The connectivity of the cysteines typically present in α-defensins is indicated by lines. The length of the peptides is denoted at the C-terminus.