Hill, Robert E How to make a zone of polarizing activity: insights into limb development via the abnormality preaxial polydactyly. [electronic resource] - Development, growth & differentiation Aug 2007 - 439-48 p. digital Publication Type: Journal Article; Review ISSN: 0012-1592 Standard No.: 10.1111/j.1440-169X.2007.00943.x doi Subjects--Topical Terms: AnimalsBody Patterning--physiologyExtremities--embryologyGene Expression Regulation, Developmental--physiologyHedgehog Proteins--physiologyHumansPolydactyly--embryology