阳性选择决定了成熟T细胞的MHC限制性，阴性选择使机体获得自身免疫耐受。
The MHC restriction of t cell is determined in positive selection. The tolerance of t cells to autoantigen is acquired during negative selection.
本文分析了从大麦成熟胚培养快速建立胚性悬浮细胞系的两个关键步骤。
The present paper analysed two key procedures for rapid establishment of embryogenic cell suspension cultures derived from barley mature embryo.
草鱼一年多次产卵的生物学基础主要是：(1)成熟草鱼卵母细胞发育的不完全同步性。
The biological basis consists of: (1) the development of oocytes in the ovary of the brood fish is not completely synchronous.
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