Okay, the user wants me to translate "signaling compounds" into Japanese. Let me think about the correct term here. "Signaling" in a scientific context usually translates to 信号 (しんごう), and "compounds" would be 化合物 (かごうぶつ). So combining them, it should be 信号化合物. I need to make sure there's no existing Japanese term that's more commonly used. Maybe checking some references... Yeah, 信号化合物 is the standard translation. The user also mentioned if the content is already in Japanese, leave it as is. Since the input is in English, I need to translate it. No explanations, just the translation. Alright, that's straightforward.