胚珠是半球形的，有2个被膜，腱鞘状，而原孢子细胞直接作为大孢子母细胞起作用。
The ovules are hemitropous, with 2 integuments, tenuinucellate and the archesporial cell functions directly as the mega-spore mother cell.
目的构建柔嫩艾美耳球虫子孢子表面抗原原核表达载体，并且在大肠杆菌中表达。
Objective To construct the prokaryotic expression vector of the sporozoite surface antigen gene of Eimeria tenella GZ strain and expression in Escherichia coli.
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