FAM53B and neoplasm: Both peptides showed potent antibacterial and antifungal activities (Harrison et al., 2016a,b), as well as cytotoxic effects in both tumour and non-tumour cell lines at higher concentrations (Elrayess et al., 2019), although tumour cells were markedly more sensitive to the effects of Smp peptides than either stem cells or primary epithelial cells.