part of histone deacetylase complex GO:0000118 A protein complex that possesses histone deacetylase activity. HDAC complex cellular_component Note that this term represents a location, not a function; the activity possessed by this complex is mentioned in the definition for the purpose of describing and distinguishing the complex. The function of this complex is represented by the molecular function term 'histone deacetylase activity ; GO:0004407'. nucleoplasm nuclear protein-containing complex catalytic complex