Okay, the user wants me to translate "signaling compounds" into Arabic. Let me check the rules again. Rule 1 says to translate all content into Arabic. Rule 2 says if it's already in Arabic, leave it as is. Rule 3 is to provide only the translation without explanations.
First, I need to confirm that "signaling compounds" isn't already in Arabic. Since it's in English, I need to translate it. The correct translation for "signaling compounds" in Arabic would be "مركبات الإشارة" or "مركبات الإشارة الكيميائية" depending on the context. Since the user didn't specify a particular field, the general term "مركبات الإشارة" should suffice. I'll make sure there are no typos and that the translation is accurate. Then, I'll output only the translation without any extra text.
مركبات الإشارة
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