Point motion measured the change in a single point with respect to a defined segment.
The severe shortening of segments and poorly defined segment boundaries observed in all mutant embryos suggest that the mutations affect the structure of each segment, rather than their establishment, possibly by interfering with the normal function of segment polarity genes.
Here, we analyzed the first hypervariable region of mitochondrial DNA in a sample from the Caribbean island of Jamaica and compared it to aggregated populations in Africa divided according to historiographically defined segments of the continent's coastline.
Findings In this work we used patch clamp electrophysiology and immunofluorescence in tonotopically defined segments of the rat cochlea to determine the contribution of BK channels to voltage- and ligand-gated currents in outer hair cells.
In contrast, in Platynereis, Wnt4 is expressed in stripes in the anterior part of each segment and could therefore be involved in defining segment boundaries.
Information about smoking behaviour, food and alcohol consumption, the likely use of web-based resources or the type of magazine or newspaper preferred by consumers in a defined geodemographic lifestyle segment may in future prove invaluable to focus health promotion programs and to allow for effective allocation of resources.
In consequence, some models define segment lengths as a feature or consider the authorship of messages to include reciprocity as another feature, i.e. users tend to reply to comments that replied to their previous messages.
1) The authors state that the number of cells in a defined portion of a segment remains constant at all three stages, which they say confirms that epidermal cells do not divide or die.
We investigated the possibility that insulators may play a broader role in defining segments, using insulator ChIP-seq peak data generated by Nègre et al.[ 50].
The number of cells in a defined rectangular portion of the segment remained constant in all three stages at a mean of about 73 cells, confirming that the epidermal cells do not divide or die.
Ultimately, the wavefront defines segment boundaries in cooperation with the clock, and this interaction will also influence the precision and interpretation of positional information.
