by Merry Youle — In or­der to re­lease their newly as­sem­bled viri­ons, most viruses lyse the cells that have fed and housed them. This ly­sis is not a hap­haz­ard af­fair. Some phages, for ex­am­ple, em­ploy a holin-en­dolysin sys­tem to rup­ture their host's cell mem­brane and di­gest the cell wall at a pre­cisely con­trolled…