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I am working on a scientific paper and would like to ask a question regarding the use of "a role of" vs "roles of". "Dendritic cells play critical roles in expansion and antitumor efficacy of infused T cells" or "Dendritic cells play a critical role in expansion and antitumor efficacy of infused T cells" I wonder if I should use "critical roles of" because of "expansion and antitumor efficacy (plural)". Any comments would be appreciated. Thanks.

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The question is not about grammar, it's about the number of roles that dentritic cells play.

If they play a single role - that is, perform a single function - stick to the singular role. It is not relevant whether this single function affects both expansion and anti-tumour efficacy.

If they play more than one, prefer the plural roles.

I would use a hyphen with T-cells

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  • I see. Since the expansion of T-cells results in anti-tumor efficacy, I probably use "a role of" in this case. Thank you very much. – oarsman Jun 2 at 15:45

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