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Relative Changes in Hox Collinear Activation Timing Underlie Variation in Limb Position between Chicken and Ostrich
(A–I) Hoxb4 expression in chicken (A–D) and ostrich (E–I) embryos.
(J–R) Hoxb9 expression in chicken (J–M) and ostrich (N–R) embryos.
(S) Timeline of Hoxb4 (red) and Hoxb9 (blue) activation in chicken (top diagram) and ostrich (bottom diagram).
Scale bars are 100 μm. Asterisks represent the Hensen’s node; black brackets outline the presumptive LPM.
