Okay, the user wants me to translate "protein source" into French. Let me check the rules again. The first rule says to translate all content into French. The second rule states that if the content is already in French, leave it as is. The third rule is to provide only the translation without any explanations.
So, "protein source" in French would be "source de protéines". I need to make sure there's no typo. Let me confirm the translation. "Source" is correct, and "protéines" is the plural form, which matches "source" in French. No need for any changes here. The user didn't mention anything else, so just output "source de protéines" without any extra text. Alright, that's it.
source de protéines
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