細さい糸し期きMeanings1nounleptotenebiologyTechnical term in cell biology: the first stage of prophase I in meiosis, when chromosomes become visible as thin threads.減げん数すう分ぶん裂れつの前ぜん期きⅠは、細さい糸し期きから始はじまる。Prophase I of meiosis begins with the leptotene stage.
