MESHSLTLDEACAFLKISRPTATNWIRTGRLQATRKDPTKPKSPYLTTRQACIAALQSPLHTVQVSAGDDITEELKCHYSAEVKPGTPVSHCRTAKDLSSLLGQRTKGRPQSFMTS xis VXIS_BPP22 116 Excisionase and integrase are necessary for the excision of prophage from the host genome by site-specific recombination at the att site. Excisionase