Update README.md

README.md

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 Welcome to SaprotHub! SaprotHub is a collaborative community, aiming to empowers biologists by enabling them to create and train their own models without the need for advanced ML and coding expertise. We provide various preprocessed datasets and fine-tuned model checkpoints for users to directly utilize.
 
-ColabSaprot: [https://colab.research.google.com/github/westlake-repl/SaprotHub/blob/main/colab/SaprotHub.ipynb](https://colab.research.google.com/github/westlake-repl/SaprotHub/blob/main/colab/SaprotHub.ipynb)
+ColabSaprot: [https://colab.research.google.com/github/westlake-repl/SaprotHub/blob/main/colab/SaprotHub_v2.ipynb](https://colab.research.google.com/github/westlake-repl/SaprotHub/blob/main/colab/SaprotHub_v2.ipynb)
 
 For more details about the base model Saprot: [https://github.com/westlake-repl/SaProt](https://github.com/westlake-repl/SaProt)