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DNA ligase  
   RNA transcriptase  
   intron segments  
   regulatory proteins  
   nucleosome packing
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Regulatory proteins.

Regulatory proteins are the proteins that control gene expression. The others are not.

DNA ligase stitches together broken DNA strands; RNA transcriptase is another word for RNA polymerase- it makes RNA from DNA. Intron segments are simply segments of DNA that do not code for proteins... and finally, nucleosome packing is the packaging of DNA into chromosomes.
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regulatory proteins;  ligaseis used to connect nucleotides, transcriptase is used to go from rna to dna, prokaryotes lack introns
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REGULATORY PROTEINS
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