One of the best documented roles of Engrailed in vertebrates is its ability to regulate boundary formation during brain development (Joyner, 1996), classically referring to the (intracrine) transcriptional activity of the protein but without considering the possible contribution of its paracrine activity.
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At the upper portion of the plate, pure natural convection regulated the boundary-layer thickness during assisting flow whereas laminar forced convection dominated for the opposing flow case.
They are marked by fragmentation, complexity and interdependence between actors, in which state and non-state actors are both regulators and regulated, and their boundaries are marked by the issues or problems which they are concerned with, rather than necessarily by a common solution (Black 2001).
Furthermore, the prospective NR itself expresses Fgf genes after contact with the surface ectoderm to regulate the boundary between the NR and RPE by maintaining the Chx10 expression (Müller et al., 2007; Vogel-Höpker et al., 2000; Zhao et al., 2001).
In line with this observation, STM expression is regulated by several boundary specific genes (Aida et al., 1999; Borghi et al., 2007; Lee et al., 2009; Takada et al., 2001), in part via auxin signaling (Aida et al., 2002; Treml et al., 2005).
Are we actually just attempting to regulate the boundaries of identity and sexual habits of others in order to know how to feel about them?
The isthmus has been shown to have a profound influence on cerebellum development by both regulating the boundaries of midbrain territory (Sato et al., 2001; Sato and Nakamura, 2004; Foucher et al., 2006) and the size of dorsal r1, from which the cerebellum will develop (Irving and Mason, 2000; Sato and Joyner, 2009).
Meanwhile, MPs were warned on Tuesday that the revolving door of ministers and senior civil servants taking senior jobs in the private sector was now so prevalent that the boundary between the regulator and regulated had dissolved.
Indeed, for a considerable time it was believed that the budding yeast cell cycle was controlled only in G1, while the fission yeast cell cycle was regulated at the G2/M boundary.
