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Unformatted text preview: a specific nucleotide sequence in the DNA. A specific combination of transcription factors is necessary to activate a gene. Transcription factors are regulated by signals produced from other molecules. For example, hormones activate transcription factors and thus enable transcription. Hormones therefore activate certain genes. Posttranscriptional Control These mechanisms control or regulate mRNA after it has been produced. Alternative RNA Splicing This can produce variations in the mRNA produced. Different mRNA may have different introns removed. The removal of introns enables a gene to code for more than one different protein. An average human gene is thought to code for 3 different proteins. For example, experiments using radioactive labeling show that calcitonin produced by the hypothalamus is different from that produced by the thyroid. In each case, the same gene produces the protein....
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