Okay, the user wants me to translate "cell elongation" into Japanese. Let me think about the correct term here. "Cell elongation" in a biological context usually refers to the process where cells become longer, like in plant cells during growth. The direct translation would be "細胞の伸長" (さいぼうのしんちょう). I should check if there's a more standard term used in scientific literature. Maybe "細胞伸長" without the particle "の" is also possible. But since the user specified to translate all content into Japanese, and the original is in English, I should go with "細胞の伸長". Also, the user mentioned if the content is already in Japanese, leave it as is, but here it's in English. So the translation should be "細胞の伸長".