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What is the difference between field and subject and what is the discipline here?

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  • "field of study" refers a broad area of academic interest containing many topics, for example, "human cell growth is my field of study."
  • "subject of study" refers to a specific entity of interest within a given context, for example, "The HeLa cell line has emerged as an important subject of study."

I should also point out that the term subject of study is significantly less common: ngram