Dhoot, G. K., Gustafsson, M. K., Ai, X. B., Sun, W. T., Standiford, D. M., & Emerson, C. P. Regulation of Wnt signaling and embryo patterning by an extracellular sulfatase. SCIENCE, 293(5535), 1663-1666. https://doi.org/10.1126/science.293.5535.1663