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Figure 3


Fig. 3. The Fibronectin exon EIIIA was involved in dermal organization. (A,B) Chick embryo dorsal skin. (A) At HH29+, EIIIA was expressed in the periphery (red arrow) of the first feather primordia, as well as in two ribbons on either side of the first row (black arrows). (B) At HH30, the EIIIA transcripts were expressed in the periphery of primordia and in two ribbons (black arrows) on either side of feather rows, although there was a slight decrease of its expression in the three first rows (red arrow). (C,D) BMP2 and EIIIA expression in the left and right femoral tract of the same HH30 embryo. Five feather primordia of the fourth row (R4) expressed BMP2 (C), whereas two no longer expressed EIIIA in the corresponding right row (D). The additional primordia are indicated with red arrows and those no longer expressing EIIIA with black arrows. The R3, expressing the EIIIA domain (arrow) has started to form close to the distal border line. Scale bars: 800 µm in A,B; 1000 µm in C,D.





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