You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Given a disfluent sentence, modify the sentence to it to its equivalent fluent form, preserving the meaning of the sentence.

Who did the Han Chinese want to help the Khitan no I mean the Mongols fight?
Solution: Who did the Han Chinese want to help the Mongols fight?
Why? The input initially means Khitan and then changes to Mongols, hence this is correct.

New input: What kind of pathogen uh cell identifies pathogens when the antibodies on its surface complex with a specific foreign antigen?
Solution:
What kind of cell identifies pathogens when the antibodies on its surface complex with a specific foreign antigen?