以下为句子列表：
英文: Proplastid A self-duplicating undifferentiated plastid, about 0.5-1μm in diameter and found in the meristematic regions of plants. They grow and develop into plastids of different types.
中文: 前质体：能够自我复制的没有分化的质体，直径约0.5-1微米，发现于植物分生组织区域。它们生长发育为不同类型的质体。
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