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Absence of cystathionase in human fetal liver: is cystine essential?

Science (New York, N.Y.)
|July 3, 1970
PubMed

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.

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