The secondary envelope may be deposited on the primary envelope surface and it is formed by the substances secreted from the granules cells.
初级卵膜源于卵母细胞，次级卵膜由晚期滤泡细胞分泌形成。
Secreted protein can be harvested from cells culture medium directly and repeatly.
而分泌型蛋白则可以反复从培养细胞的上清中直接获取。
The xanthan gum is the extracellular polysaccharide secreted by xanthomonas campestris from wild rape. It can be produced by fermentation with starch or glucose as the carbon source.
黄原胶是野油菜黄单孢菌分泌的胞外多糖，可用淀粉或葡萄糖为碳源发酵生产。
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