surface ectoderm |
 |
detected |
| regional | At the 43-somite stage, Wnt6 expression is detected at a low level almost ubiquitously in the surface ectoderm and the underlying dermis and slightly higher in the dorsal part of the embryo (Fig. 2A). At this stage, the developing placode 3 highly expresses Wnt6, while expression is only slightly elevated at the mammary line itself and seems to follow the progression toward the limbs in a manner similar to Wnt10b expression. Similar to Wnt10b but with differences in timing and pattern, Wnt6 expression is fragmented along the flank aligned with the somites has become fainter. Of interest, Wnt6 expression is restricted to the placode (number 3) at the 43-somite stage when Wnt10b expression is less defined as a fragmented streak. |