**1.5.2 Alpha defensins**

This type of defensins is found in mammals. Their cysteine are connected between the cysteines 1-6 2-4 3-5. They show a structure of triple-stranded beta-sheet stabilized by a conserved triple disulfide bridges array (Hadjicharalambous et al., 2008). Alpha defensin sequence present more arginine than lysine residues, and it has been suggested that this high arginine content endows the alpha-defensin with a higher antibacterial activity in high salt conditions (Llenado et al., 2009).

*P. hamadryas* alpha-defensin ACYCRIPACFAGERRYGTCFYLGRVWAFCC
