Perriton, Claire L Sonic hedgehog signaling from the urethral epithelium controls external genital development. [electronic resource] - Developmental biology Jul 2002 - 26-46 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0012-1606 Standard No.: 10.1006/dbio.2002.0668 doi Subjects--Topical Terms: AnimalsCell Differentiation--physiologyCell Polarity--physiologyChick EmbryoEmbryonic InductionEpithelial Cells--cytologyFemaleGene Expression Regulation, DevelopmentalGenitalia--cytologyHedgehog ProteinsMaleMiceSignal TransductionTrans-Activators--physiologyUrethra--embryology