by Jamie Henzy — Read­ers of STC are likely aware that se­quences from viruses in­fect­ing a host can some­times wind up in­serted into the host chro­mo­so­mal DNA, even be­ing passed on to off­spring if the in­ser­tion oc­curs in an egg or sperm cell. This hap­pens most fre­quently with retro­viruses, which in­sert into host DNA as part of...