Absence of Cystathionase in Human Fetal Liver: Is Cystine Essential?
- 3 July 1970
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 169 (3940), 74-76
- https://doi.org/10.1126/science.169.3940.74
Abstract
Cystathionase activity is not measurable in the livers of 24 human fetuses and 3 premature infants, and the concentration of cystathionine in the liver is higher than that of the brain. The placenta does not subserve the trans-sulfuration function. Cystine (or cysteine) thus may be an essential amino acid in the immature human.Keywords
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