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all the transcription factors (e.g., the steroid receptors) needed to turn genes on (and off)
all the splicing factors needed to process pre-mRNA into mature mRNA molecules; that is, to cut out intron regions and splice the exon regions.
The regulation and selection of splice sites is done by Serine/Arginine-residue proteins, or SR proteins. The use of alternative splicing factors leads to a modification of the definition of a "gene".
 See also: Gene, Protein, Amino acids, DNA, Human
  
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