以下为句子列表：
英文: Callose was absent at megasporocyte stage.
中文: 大孢子母细胞时期细胞壁内缺少胼胝质。
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英文: Observations on Ultrastructure of Pollen Development from Microsporocyte to Early Two-Celled Pollen in Welsh Onion (Allium fistulosum)
中文: 大葱小孢子母细胞至二胞早期花粉发育的超微结构观察
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英文: LOCALIZATION OF CALLOSE DURING THE OCCURRENCE OF MEGASPOROCYTE IN GASTRODIA ELATA BLUME
中文: 天麻大孢子发生时胼胝质的定位观察
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