kru kru hernandezat bfg.oxfordjournals.org Functional analysis of the role of POK transcriptional repressors 24 Mar 2007 . of its requirement for zinc, is the large C2H2 Kru«ppel- type zinc finger . members of the so called POK (POZ and Kru«ppel). Jose A. Costoya . Pessler F, Pendergrast PS, Hernandez N. Purification and characterization of .