| The interactions of CGI 55 with Daxx , Topors , PIASy , and UBA 2 were confirmed by in vivo colocalization experiments in HeLa cells , by using green ( GFP ) and red fluorescence fusion proteins . ^^^ Although Daxx and Topors co localized with promyelocytic leukemia protein ( PML ) , CGI 55 itself as well as PIASy and UBA 2 showed only little co localization with PML . ^^^ |