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上皮细胞中含有一种细胞连接结构——桥粒。我们从牛鼻表皮组织中初步将桥粒成分提取出来，在电镜下观察，桥粒结构保存较好。提取的桥粒成分作SDS-PAGE，结果与有关文献比较，我们认为DPⅠ可能有3种成分，DPⅠ_a、Ⅰ_b、Ⅰ_c，分子量分别为235、226和215kd；DPⅡ可能有DPⅡ_a、Ⅱ_b、Ⅱ_c3种成分，分子量分别为206、198和186kd；DPⅢ有2种成分，DPⅢ_a、Ⅲ_b，分子量为81和86kd。其它蛋白成分与文献报道相似。DPⅣ分子量为82kd，DGⅠ分子量为150kd，DGⅡ_a、Ⅱ_b分子量为135和118kd。另有一小分子量蛋白，分子量为22kd，可能是DGⅢ。
Epithelial cells contain a cell junction structure - desmosomes. We initially extracted the desmosomes from the bovine nasal epidermis, and observed under electron microscope, the desmosome structure is well preserved. The results showed that there were three components of DPⅠ, DPⅠ_a, Ⅰ_b and Ⅰ_c with the molecular weights of 235, 226 and 215kd, respectively. The results showed that there were three components of DPⅡ_a, Ⅱ_b and Ⅱ_c , The molecular weight of 206,198 and 186kd respectively; DPⅢ has two kinds of components, DPⅢ_a, Ⅲ_b, molecular weight of 81 and 86kd. Other protein components and reported in the literature similar. DPⅣ molecular weight of 82kd, DG Ⅰ molecular weight of 150kd, DG Ⅱ a, Ⅱ b molecular weight of 135 and 118kd. Another small molecular weight protein, molecular weight of 22kd, may be DG Ⅲ.