Transposase-derived protein that may have nuclease activity (Potential). Does not have transposase activity. {ECO:0000269|PubMed:15169610, ECO:0000269|PubMed:18339812, ECO:0000305}. This is the function of Ensembl gene identifier ENSG00000180423 (HARBI1, harbinger transposase derived 1).