孢原细胞处于珠心表皮之下，直接起大孢子母细胞的功能。
A single archesporium differentiates immediately below the nucellar epidermis, it functions directly the megaspore mother cell.
认为由花粉管的流出物能使珠心细胞活化。
Activation of nucellar cells by discharge from the pollen tubes has been claimed.
目的：建立免疫磁珠法体外分离纯化人牙周膜干细胞的方法。
Objective: To isolate and identify the periodontal ligament stem cells from human molars.
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