Update README.md

README.md

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 <img src="./figures/intro.jpg" alt="image" width=60%>
-The project <b>ChatCell</b> aims to help researchers to use either natural or single-cell language, thereby facilitating single-cell analysis. Black and red texts denote human and single-cell language, respectively. Have a try with the demo at 
-<a href="https://chat.openai.com/g/g-vUwj222gQ-chatcell">💻GPTStore App</a>.
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+The project <b>ChatCell</b> 
+aims to facilitate single-cell analysis with natural language, which derives from the <a href="https://github.com/vandijklab/cell2sentence-ft">Cell2Sentence</a>
+technique to obtain cell language tokens and utilizes cell vocabulary adaptation for T5-based pre-training.
+<a href="https://chat.openai.com/g/g-vUwj222gQ-chatcell">💻GPTStore App</a>.
 
 
 ## 📌 Table of Contents