diff --git a/wiki/pages/engineering.html b/wiki/pages/engineering.html
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@@ -140,7 +140,7 @@
       <h5>Test</h5>
       <p>We performed plasmid double transformation on the mating pathway knockout yeast strain and wild-type yeast (control), and then conducted the muscone induction experiment again. The results are as follows. We found that compared with the wild type, the nonspecific fluorescence signal was significantly weakened in the yeast strain with mating pathway knockout after induction with glucose.</p>
       <div class="image-container" style="display: flex; flex-direction: column; align-items: center;">
-        <img src="https://static.igem.wiki/teams/5187/wiki-engineering-fig/figure8.png" alt="ibd_figure" class="shadowed-image" style="width: 30%; max-width: 350px;">
+        <img src="https://static.igem.wiki/teams/5187/wiki-engineering-fig/figure8.jpg" alt="ibd_figure" class="shadowed-image" style="width: 30%; max-width: 350px;">
         <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 8 Corrected muscone induction experiment (Ko2: selected one of the CRISPR knockout strains; Gal: induced by galactose; Glc: induced by glucose; +: induced by muscone; -: no special treatment)</p>
       </div>
       <h5>Learn</h5>
@@ -148,6 +148,52 @@
     </div>
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+  <div class="row mt-4">
+    <div class="col-lg-12">
+      <h3>Big circle3: Integration</h3>
+      <p>After confirming that both the lactate secretion subsystem and the muscone switch subsystem can work normally, we are ready to integrate the two parts together to construct a complete treatment system.</p>
+      <h4>Cycle1</h4>
+      <h5>Design</h5>
+      <p>The molecular switch still uses the muscone receptor and Gα protein mentioned earlier, and the downstream response module is replaced with the lactate dehydrogenase gene regulated by the pFUS1 promoter.</p>
+      <h5>Build</h5>
+      <p>We transferred the complete treatment system into both mating pathway knockout yeast and wild-type yeast (control), and then proceeded to the next step of induction experiment.</p>
+      <div class="image-container" style="display: flex; flex-direction: column; align-items: center;">
+        <img src="https://static.igem.wiki/teams/5187/wiki-engineering-fig/figure9.png" alt="ibd_figure" class="shadowed-image" style="width: 30%; max-width: 350px;">
+        <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 9 pFUS1 promoter-ldhA-pYES2 plasmid</p>
+      </div>
+      <h5>Test</h5>
+      <p>We conducted muscone induction on the two yeast strains constructed above under glucose as the carbon source, and then measured the lactate concentration using standard methods. The results are shown below. We found that after knocking out the mating pathway, the nonspecific signal of the treatment system was significantly reduced.</p>
+      <div class="image-container" style="display: flex; flex-direction: column; align-items: center;">
+        <img src="https://static.igem.wiki/teams/5187/wiki-engineering-fig/figure10.png" alt="ibd_figure" class="shadowed-image" style="width: 30%; max-width: 350px;">
+        <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 10 Muscone-induced lactate measurement results of the treatment system. (wt: wild-type yeast transformed with the treatment system; ko2: mating pathway knockout yeast transformed with the treatment system; mus: induced by muscone)</p>
+      </div>
+      <h5>Learn</h5>
+      <p>This measurement of lactate secretion further confirms our previous judgment: the mating pathway signaling pathway that naturally exists in yeast cells can cause nonspecific activation of downstream signals. However, unfortunately, in the group induced by galactose, whether it is wild-type yeast or mating pathway knockout yeast, the amount of lactate secretion did not meet our expectations. We will try to solve this problem in the future.</p>
+      <hr>
+      <h4>Cycle2</h4>
+      <h5>Design</h5>
+      <p>Because the synthesis of muscone receptor and Gα protein induced by galactose is not very stable, and in order to better fit the applicability of the subsequent treatment system, we decided to change the promoter of muscone receptor and Gα protein to a strong constitutive promoter in yeast, expecting this to solve the difficulties we encountered earlier.</p>
+      <h5>Build</h5>
+      <p>We redesigned the plasmid according to the sequence, as shown in the figure below.</p>
+      <div class="image-container" style="display: flex; flex-direction: column; align-items: center;">
+        <img src="https://static.igem.wiki/teams/5187/wiki-engineering-fig/figure11.png" alt="ibd_figure" class="shadowed-image" style="width: 30%; max-width: 350px;">
+        <p style="text-align: center; font-size: 0.9em; margin-top: 10px;">fig 11 </p>
+      </div>
+      <h5>Test</h5>
+      <p>To be continue…</p>
+      <h5>Learn</h5>
+      <p>To be continue…</p>
+    </div>
+  </div>
+
+  <div class="row mt-4">
+    <div class="col-lg-12">
+      <h2 id="Colonization System">
+        <h2>Colonization System</h2>
+        <hr>
+      <p>To be continue…</p>
+  </div>
+
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