by Merry Youle — When a phage in­vades a host's premises, it de­liv­ers only its genome and per­haps a few spe­cial­ized pro­teins needed im­me­di­ately upon ar­rival. Its plan is sim­ply to su­per­vise pro­duc­tion. The host is re­lied on to pro­vide not only the raw ma­te­ri­als and en­ergy, but also the pro­duc­tion equip­ment needed to…