Seifert, A. ., Bouldin, C. ., Choi, K. ., Harfe, B. ., & Cohn, M. . (2009). Multiphasic and tissue-specific roles of sonic hedgehog in cloacal septation and external genitalia development. Development (Cambridge, England), 136(23), 3949-57. https://doi.org/10.1242/dev.042291

Seifert, A. ., Harfe, B. ., & Cohn, M. . (2008). Cell lineage analysis demonstrates an endodermal origin of the distal urethra and perineum. Developmental Biology, 318(1), 143-52. https://doi.org/10.1016/j.ydbio.2008.03.017 (Original work published 2008)