Deep-sea drill cores have revealed the presence of metal-rich sediments on top of ancient oceanic crust away from ridge crests.
Expression quickly becomes confined to the neural plate (Fig. 4 B, F) where it remains until at least stage 14, including streams of neural crest cells migrating away from the neural tube (Fig. 4 D).
One possibility is that the genetic and/or epigenetic mechanisms that prevent uveal melanocytes, which are derived from the migratory cranial neural crest, from migrating away from the eye may be disrupted by the loss of cell identity.
All peripheral sensory and autonomic neurons (sympathetic, parasympathetic and enteric) arise from neural crest cells that migrate away from the neural tube and navigate to the location where ganglia will form.
The river is still a couple of weeks away from cresting in the delta, but experts are predicting all-time records here.
The engorged river is still several days away from cresting in Memphis but has already prompted the authorities to go door to door in areas that are likely to be affected, urging hundreds of residents to move to higher ground.
Rows of vines fell away from the crest of a hill, revealing the Alps, which stretched across the horizon in a giant arc, from Monte Viso in the west to the Matterhorn in the north.
As the seafloor is propagated away from the crests, it also sinks; thus, guyots become more deeply submerged with time.
The ocean floor is thus pushed at right angles and in opposite directions away from the crests.
