Yang, Y. et al.1997. Relationship between dose, distance and time in sonic hedgehog mediated regulation of anteroposterior polarity in the chick limb. Development 124: 4393-4404

Yu, C.E. et al. 1989. Positional cloning of the Werner's syndrome gene. Science 272: 258-262

Yule, H. 1858. A narrative of the mission sent by the Governor-General of India to the court of Ava in 1855. Bell, N.Y.

Zeikany, J. et al. 1997. Regulation of number and size of digits by posterior Hox genes: A dose dependent mechanism with potential evolutionary implications. Proceeding of the National Academy of Sciences, USA 94: 1395-13700

Zapperi. R. 1995. Ein Haarmensch auf einem Gamalde von Agostino Carracci. in Hagner, M. (ed.) Der falsche Korper: Bietriige zu einer Geschichte der Monstrositaten. Wallstein, Gottingen

Zekraoui, L. et al. 1997. High frequency of the apolipoprotein ε4 allele in African pygmies and most of the African populations in sub-Saharan Africa. Human Biology 69: 575-581

Zeng, X. et al. 2001. A freely diffusible form of sonic hedgehog mediates long-range signalling. Nature 411: 716-720

Zguricas, J. et al. 1999. Clinical and genetics studies on 12 preaxial polydactlyly families and refinement of the localization of the gene responsible to a1.9 cM region on chromosome 7q35. Journal of Medical Genetics 36: 32-40

Zhou, X.-P. et al. 2000. Germline and germline mosaic PTEN mutations associated with a Proteus-like syndrome of hemihypertrophy, lowerlimb asymmetry, arteriovenous malformations and lipomatosis. Human Molecular Genetics 19: 765-768

Zhou, X.-P. et al. 2001. Association of germline mutation in the PTEN tumor suppressor gene and Proteus and Proteus-like syndromes. Lancet 358: 210-211

Zimmerman, L.B. et al. 1996. The Spemann organizer signal noggin binds and inactivates Bone morphogenetic protein-4. Cell 86: 599-606

Zou, H. and L. Niswander. 1996. Requirement for BMP signalling in interdigital apoptosis and scale formation. Science 272: 738-741