Embryological Evidence Identifies Wing Digits in Birds as Digits 1, 2, and 3

Anterior shift in gene expression precedes anteriormost digit formation in amniote limbs

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Pentadactyl ground state of the manus of Alligator mississippiensis and insights into the evolution of digital reduction in Archosauria

(2010) Hans C.E. Larsson et al.   JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION

Vertebrate limb bud development: moving towards integrative analysis of organogenesis

(2009) Rolf Zeller et al.   NATURE REVIEWS GENETICS

Uncoupling Sonic Hedgehog Control of Pattern and Expansion of the Developing Limb Bud

(2008) Jianjian Zhu et al.   DEVELOPMENTAL CELL

The Evolution of HoxD-11 Expression in the Bird Wing: Insights from Alligator mississippiensis

(2008) Alexander O. Vargas et al.   PLoS One

Unique SMAD1/5/8 activity at the phalanx-forming region determines digit identity

(2008) T. Suzuki et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA