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       <h3 class="h2-h3">Results 3—dCpf1 assisted CRISPRi system to inhibit the pdc </h3>
-      <h3>expression</h3>
+      <h3>Expression</h3>
       <br>
       <h3>
              The plasmid D1 containing gRNA targeting pdc was transferred into the recombinant strain ZMQ11-A6, and a new strain ZMQ11-A6-D1 was obtained. The isobutanol production in ZMQ11-A6-D1 was investigated with different tetracycline concentrations, the results were shown in Fig.1-3.