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    Bioessays. 1989 May;10(5):163-6.

    Evolutionary aspects of urea cycle enzyme genes.

    Abstract

    The functions and expression pattern of urea cycle enzymes have undergone considerable changes during the course of evolution. Sequence analyses shows that urea cycle enzymes from mammals are homologous to microbial enzymes of the arginine-metabolic pathway. Recently, an unexpected relationship was found between argininosuccinate lyase (EC 4.3.2.1), the fourth enzyme of the cycle, and delta-crystallin, a lens structural protein of birds and reptiles.

    PMID:
    2662961
    [PubMed - indexed for MEDLINE]

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