Apparent precursor of a secreted, cationic, proline- and cysteine-rich peptide that contains Cys-Pro-Xaa repeats (PubMed:7896294). Unlike cryptdin, the proposed mature peptide region lacks the structural motif characteristic of defensins (PubMed:7896294). It may have microbicidal activities (PubMed:15235601). Paneth cells of the small bowel. Belongs to the alpha-defensin family.