抗原修复——原因 *常规的石蜡切片标本均用甲醛固定,结果使得: -抗原性物质形成醛键、羧甲键而被封闭了部分抗原决定簇; -蛋白之间发生交联而使抗原决定簇隐蔽。 *要求:在染色时,需要先进行抗原修复或暴露,即将固定时分子之间所形成的交联破坏,而恢复抗原的原有空间形态抗原修复——方法 *化学方法 *加热方法 -水浴加热法 -微波照射法 -高压加热法 -酸水解法
抗体(antibody)指机体的免疫系统在抗原刺激下,由B淋巴细胞或记忆细胞增殖分化成的浆细胞所产生的、可与相应抗原发生特异性结合的免疫球蛋白。主要分布在血清中,也分布于组织液及外分泌液中。
产品名称:结肠直肠癌缺失基因抗体,Anti-DCC抗体优惠促销
中文名称:结肠直肠癌缺失基因抗体
英文名称:Anti-DCC
产品编号:byk-0592R
产品规格:0.1ml/0.2ml
产品用途:科研实验
性 状: Lyophilized or Liquid
浓 度: 1mg/1ml
亚 型: IgG
贮 存: 贮存于-20℃.
相关标记: HRP Biotin Gold RBITC AP FITC Cy3 Cy5 Cy5.5 Cy7 PE PE-Cy3 PE-CY5 PE-CY5.5 PE-CY7 APC Alexa Fluor 350 Alexa Fluor 488 Alexa Fluor 555 Alexa Fluor 647
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结肠直肠癌缺失基因抗体,Anti-DCC抗体优惠促销 产品详情:
Deleted in colorectal cancer (DCC, chromosome 18q21) was originally identified as a putative tumor suppressor gene that is lost in more than 70% of colorectal cancers. The gene has also been deleted in several other types of cancer. The DCC protein is a type I transmembrane glycoprotein that belongs to the immunoglobulin (Ig) superfamily. The extracellular domain is composed of four Ig like domains and six fibronectin type III repeats. Native DCC is found in three isoforms. Two forms, a long and a short isoform, are produced from the same gene but have different initiation sites. The third isoform, produced by alternative splicing, is expressed only in embryonic tissue. Mouse DCC extracellular domain shares 97% and 99% homology with human and rat DCC extracellular domains, respectively. In adults, DCC is highly expressed in the brain but is also expressed at very low levels in multiple normal tissues. In the embyro, high levels of expression are detected in the brain and neural tube. DCC functions as a receptor or a component of a receptor for netrins and mediates the effects of netrins on commissural axons. Netrins are chemoattractants responsible for the guidance of commissural axons at the midline and of motor axons to the their target muscles. DCC induces apoptosis in the absence of ligand binding, blocks apoptosis when engaged by netrin 1, and also acts as a caspase substrate.
抗体是具有4条多肽链的对称结构,其中2条较长、相对分子量较大的相同的重链(H链);2条较短、相对分子量较小的相同的轻链(L链)。链间由二硫键和非共价键联结形成一个由4条多肽链构成的单体分子。轻链有κ和λ两种,重链有μ、δ、γ、ε和α五种。 整个抗体分子可分为恒定区和可变区两部分。在给定的物种中,不同抗体分子的恒定区都具有相同的或几乎相同的氨基酸序列。可变区位于"Y"的两臂末端。在可变区内有一小部分氨基酸残基变化特别强烈,这些氨基酸的残基组成和排列顺序更易发生变异区域称高变区。高变区位于分子表面,多由17个氨基酸残基构成,少则只有2 ~ 3个。高变区氨基酸序列决定了该抗体结合抗原抗原的特异性。一个抗体分子上的两个抗原结合部位是相同的,位于两臂末端称抗原结合片段(antigen-binding fragment, Fab)。"Y"的柄部称结晶片段(crystalline fragment,FC),糖结合在FC 上。