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Detailed structural analysis of the first 12 cDNAs ( HZF 1-10 ) and a partial characterization of HZF 11-42 revealed that a common feature of human Kruppel-related zinc finger proteins is the presence of tandem arrays of zinc fingers ranging in number from 3 to over 20 that are preferentially located in the carboxy-terminal regions of the proteins.
 zinc finger proteins, Kruppel-related zinc finger proteins, HZF 11-42, zinc fingers, carboxy-terminal regions, cDNAs, human Kruppel-related zinc finger proteins, HZF 1-10
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 zinc finger proteins, Kruppel-related zinc finger proteins, HZF 11-42, zinc fingers, carboxy-terminal regions, cDNAs, human Kruppel-related zinc finger proteins, HZF 1-10