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从羊、牛和人各自分离出的贾第虫株都具有一个大的膜蛋白，用生物素和放射性碘表面标记后，ＳＤＳＰＡＧＥ显示此膜蛋白分子量的大小，在不同种群之间是有着明显的差异。３５Ｓ半胱氨酸代谢标记及电泳分析表明每个纯培养的虫株都有一个主要蛋白，表面标记技术展示此蛋白的大小恰好就是它的表面蛋白。此项研究表明富含半胱氨酸蛋白和表面蛋白是同一种蛋白。来自不同宿主的贾第虫株都存在着富含半胱氨酸表面蛋白（ＣＲＩＳＰ）。
Giardia strains isolated from sheep, cattle and humans each have a large membrane protein, with biotin and radioactive iodine surface markers, SDS PAGE showed the size of the molecular weight of the membrane protein, there is between different populations Significant differences. 35S cysteine metabolism markers and electrophoresis analysis showed that each pure cultured insect strains have a major protein, surface marker technology to show the size of this protein is just its surface protein. This study shows that cysteine-rich protein and surface protein are the same protein. Giardia strains from different hosts are present with cysteine-rich surface protein (CRISP).