Synonyms:C Krox, DKFZp686G01254, hcKrox, THPOK, ZBTB15, ZBTB7B, Zfp 67, ZFP67, Zinc finger protein 67 homolog, Zinc finger protein Th POK, ZNF857B Background:Transcription regulator that acts as a key regulator of lineage commitment of immature T-cell precursors. Necessary and sufficient for commitment of CD4 lineage, while its absence causes CD8 commitment. Development of immature T-cell precursors(thymocytes) to either the CD4 helper or CD8 killer T-cell lineages correlates precisely with their T-cell receptor specificity for major histocompatibility complex class II or class I molecules, respectively. Transcriptional repressor of the collagen COL1A1 and COL1A2 genes. May also function as a repressor of fibronectin and possibly other extracellular matrix genes(By similarity).