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Phosphorylated STAT5B dimers translocate to the nucleus where they bind to specific DNA sequences and activate transcription of IGF-1, insulin-like growth factor binding protein-3 (IGFBP-3), and acid-labile subunit genes

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They help confirm deficiencies, detect potential toxic levels, and tailor doses to individual needs

J Physiol Pharmacol .2010, 61(2): 24 -50
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