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Specific
transcription factor Sp1 (SP1, TSFP1)
transcription factor Sp2; stimulatory protein 2 (Sp2, KIAA0048)
transcription factor Sp3; stimulatory protein 3 (Sp3, SPR-2)
transcription factor Sp4; stimulatory protein 4 (Sp4, SPR-4)
General
DNA-binding protein
transcription factor (TF)