Probable transcription factor. In adult brain, testis and kidney. In lower levels also in adult ovaries and embryonic stem cells. In embryo in developing neuroectoderm of brain, inner ear and spinal chord. Also weakly and transiently expressed in embryonic branchial arches, notochord, limb buds and heart. During embryogenesis detected from 7 dpc onward in tissues derived from mesoderm and ectoderm. Lacks two zinc finger domains (6 and 7) and is the major isoform. Belongs to the sal C2H2-type zinc-finger protein family.