I think that in corpus is the exact Latin phrase, so there would be no 'the'. I trust I will be corrected if I am wrong.
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AnonymousThank you. There is no italic, though. I have found some instances of "in corpus" and one instance of "in the corpus".I rather imagine that there are several ways of doing it. The main thing is to be sure to follow the practice of whatever journal, institution or publication you are dealing with.