Okay, the user wants me to translate "protein dimer" into Thai. Let me check if the term is already in Thai. Since it's an English term, I need to translate it. The correct translation for "protein dimer" in Thai is "ไดเมอร์โปรตีน". I should make sure there's no existing Thai version, but since it's a scientific term, it's likely translated directly. I'll provide the translation without any explanations as per the rules.