here,
however, that these arteries arise from angiogenic sprouts of the major vein

that returns circulating blood to the embryonic heart. Thus some
differentiated
venous cells retain developmental plasticity and respond to local signals to

convert to coronary arteries, capillaries and veins.
Kristy Red-Horse, Hiroo Ueno, Irving L. Weissman and Mark A. Krasnow
doi:10.1038/nature08873
Abstract:
http://www.nature.com/nature/journal/v464/n7288/abs/nature08873.html
Article:
http://www.nature.com/nature/journal/v464/n7288/full/nature08873.html

Neurogenic radial glia in the outer subventricular zone of human neocortex
In the mammalian brain, the subventricular zone (SVZ) produces neural
progenitor
cells that migrate into the cortex to populate the upper layers. In humans
this
region is massively expanded, producing an outer SVZ (OSVZ). Here, live-cell

imaging of developing human tissue was used to show that the OSVZ has
similar
characteristics to the SVZ, with progenitor cells proliferating in a way
that
depends on the Notch protein. The findings have implications for our
understanding
of how the complex human brain evolved.
David V. Hansen, Jan H. Lui, Philip R. L. Parker and Arnold R. Kriegstein
doi:10.1038/nature08845
Abstract:
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature08845.html
Article:
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature08845.html

----------------------
LETTERS
----------------------
Escape of about five per cent of Lyman-[agr] photons from high-redshift
star-forming galaxies pp562-565
The main observational signature of star-forming galaxies at the highest
redshifts is the Lyman-[alpha] (Ly[alpha]) emission line. But Ly[alpha]
photons scatter in the neutral interstellar medium of their host galaxies,
and may therefore be greatly absorbed by interstellar dust. It is now shown
that the average escaping fraction of Ly[alpha] photons from star-forming
galaxies at redshift z = 2.2 is just 5 per cent. This implies that numerous
conclusions based on Ly[alpha]-selected samples will require upwards
revision
by an order of magnitude.
Matthew Hayes et al.
doi:10.1038/nature08881
Abstract:
http://www.nature.com/nature/journal/v464/n7288/abs/nature08881.html
Article:
http://www.nature.com/nature/journal/v464/n7288/full/nature08881.html

Anomalous structure in the single particle spectrum of the fractional
quantum
Hall effect pp566-570
A two-dimensional gas of electrons is a powerful test-bed for the
fundamental
physics of interacting particles, and has been much studied in the context

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