SALL4 (SAL-like protein 4) is a 1324aa member of the SAL protein family that possess multiple C2H2-type zinc-fingers. It is a transcriptional repressor when associated with histone deacetylase and a transcriptional activator of the Wnt pathway in its native form. It contributes to generation of induced pluripotent stem cells and to axis formation during development. It is frequently overexpressed in germ cell tumors and acute myeloid leukemias. Mutations of human SALL4 can result in conditions such as Okihiro, Duane Radial Ray, or Holt-Oram syndromes. The region used as an immunogen is common to both SALL4 and the ubiquitous 617aa isoform, SALL4B; it shares 76% aa identity between human and mouse.