The degradation of l-histidine and trans
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Daniel H. Hug; Duane D. Dunkerson; John K. Hunter
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Article
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1999
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Elsevier Science
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English
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UV-B radiation suppresses cell-mediated immunity. Histidine forms trans-urocanic acid (truns-UCA) enzymatically in the stratum comeum. Photoisomerization of trans-UCA to cis-urocanic acid (cis-UCA) has been proposed for the initiation of an immunosuppressive process. Many microorganisms described in