| Our results indicate that three related class 2 deacetylases , HDAC 4 , HDAC 5 , and HDAC 7 can associate with BCL 6 in vivo and in vitro . ^^^ A highly conserved domain in the N terminal region of HDAC 5 and HDAC 7 as well as the zinc finger region of BCL 6 were found necessary for the complex formation in vivo and in vitro . ^^^ |