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Because this test can be used retrospectively, unlike many of the current methods used to detect cell proliferation, and because it does not require the ingestion of a radioactive or chemical tracer, the method can be readily applied to both in vivo and postmortem samples of human tissues.

In today’s Cell, Frisen and colleagues report how they used the dating method to dismiss the possibility that neurogenesis takes place in the adult human cortex.

Analysis of growth rings from pine trees in Sweden shows that the proliferation of atomic tests in the 1950s and 1960s led to an explosion in levels of atmospheric carbon 14.

The tritiated-thymidine birthdating studies also included quantification of the birth of all postnatally generated retinal cell types in the mouse.methodologies in rat and mouse retina, we have demonstrated that there are distinct waves of genesis of the two major bipolar cell types, with cone bipolar genesis preceding rod bipolar genesis.These waves of bipolar genesis correspond to the order of genesis of the presynaptic photoreceptor cell types. The adult retina contains a complement of well-characterized neurons and glia in three cellular layers (outer nuclear, inner nuclear and ganglion cell layers) separated by two distinct plexiform layers (the inner and outer plexiform layers) containing cellular processes and synapses [].But the almost tenfold increase in atmospheric C14 that peaked around the mid-1960s has been followed by a rapid decline since the nuclear test ban treaties and the cessation of high-yield, above-ground nuclear tests.In fact, C14 is assimilated so rapidly that from about 1963, its half-life in the atmosphere has only been about 11 years.

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This Guide to the new features brought by this expansion will give you a summary of what's new and link you to in-depth articles for the most important gameplay elements.

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Czech Republic Women in Culture answers the following types of practical questions: Whether you are relocating to Czech Republic , studying the culture, doing business in the country, in need of an overview or more specifics, this informative report covers the bases.

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"Rx" (℞) is often used as a short form for prescription drug in North America- a contraction of the Latin word "recipe" (an imperative form of "recipere") meaning "take".