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- W2116741618 abstract "The redistribution of valine, from the nonrenewable yolk supply into excitable tissues, was studied during the first 15 days of chick embryogenesis. Valine levels in the extraembryonic circulation (the vitelline plexus) peak between days 7-9 (E7-9) and then decline steeply. In their first phase of differentiation (E2-E4), all embryonic tissues contain more valine than the blood plexus. From E4 to E7, the heart and brain exhibit initially a rapid fall in valine, but from day 7 on the decrease becomes more gradual. The eye during the same period reaches an equilibrium with circulating valine; as these levels fall from E9 to E15, the eye retains the valine that accumulated. Against this pattern of change, characteristic for an essential amino acid during embryogenesis, glutamine levels are at any time from two- to threefold higher than valine in all tissues. In the circulation, this ratio remains constant throughout the 15 days of embryonic development. Eye glutamine, higher on day 4, by E7 has entered into an equilibrium with glutamine in the plexus. A steady but two times higher glutamine level is maintained in the heart, although during the later stages of development it gradually tends to approach the plexus content. In sharp contrast, starting on E7 and accelerating on E9, a large increase of glutamine relative to valine or other essential amino acids is seen in developing brain tissue. This appears typical for most metabolic amino acids, suggesting that by days 9-10 the essential amino acid supply in the brain is being exhausted.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2116741618 date "1988-01-01" @default.
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- W2116741618 title "Development of the amino acid pools in chick embryo brain, heart, and eye: Taurine, valine, glutamine, and phosphoethanolamine" @default.
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- W2116741618 doi "https://doi.org/10.1002/jnr.490190115" @default.
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