Wnt3a is a signaling molecule belonging to the Wnt family of secreted glycoproteins. It plays a crucial role in embryonic development, stem cell maintenance, and tissue homeostasis. Wnt3a activates the canonical Wnt signaling pathway, leading to the stabilization of β-catenin and the transcription of target genes., In research, Wnt3a is used to stimulate Wnt signaling in cell culture models, promote stem cell self-renewal, and study the effects of Wnt signaling on cell fate and differentiation. It is often supplied as a recombinant protein or produced by Wnt3a-secreting cells. The concentration and source of Wnt3a should be carefully considered for optimal activity.