| Helix-loop helix proteins |
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| two helices, one linker region over 40-50 bp |
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| hetero- and homodimers--stabilized by helices |
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| basic region often present to bind to DNA |
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| MyoD, myogenin |
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| may form heterodimer with ubiquitous HLH partners |
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| (E12,
E47) |
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| Myc--cellular counterparts of oncogenes, involves in |
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| growth regulation |
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