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Intrauterine transplantation induces tolerance in the setting of the immature immue system but is hampered by low levels of engraftment. Glycogen synthase kinase 3 (GSK3) inhibition enhances stem cell proliferation, and Loukogeorgakis and colleagues report excellent engraftment in utero in mice following surface attachment of nanoparticles loaded with GSK3 inhibitor to donor stem cells.