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    bioRxiv : the preprint server for biology
    |February 3, 2025
    PubMed
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    SARS-CoV-2 感染会增加 kynurenine (Kyn) 水平,从而激活阿里尔碳化合物受体 (AHR) 和组织因子 (TF) 途径. 这一发现表明Kyn-AHR-TF轴是治疗COVID-19相关凝血病的潜在目标.

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    Repressible Operon: trp Operon01:21

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    The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...