From English Wikipedia: http://en.wikipedia.org/w/index.php?title=Image:SDSPAGE.png&action=edit

Example of SDS-PAGE of proteins visualized by autoradiography. Two radioactively labeled protein samples were run in adjacent lanes of the gel (1, 2). The larger proteins (β-galactosidase size standard, marker, E-cadherin cell-to-cell adhesion protein, pp120) are towards the top of the gel and smaller proteins (vSRC tyrosine-specific protein kinase, 60,000 Da) are towards the bottom. As its name implies, pp120 is a 120,000 Da phosphoprotein. The β-galactosidase and bovine serum albumin (BSA) size standards were in an adjacent lane (not shown). The radioactive label was ³²Phosphate from the gamma position phosphate group of ATP. The vSRC protein is an oncogene that disrupts cell growth by its phosphorylation of other proteins such as β-catenin, a protein that links E-cadherin to the cell's cytoskeleton. In this experiment, the vSRC protein auto-phosphorylated itself and the other proteins (E-cadherin, pp120 and β-catenin). After electrophoresis, medical X-ray film was exposed to the dried gel and regions of dark exposure of the film (the "bands") indicate the position of the radioactively-labeled proteins. Lane 1 is a negative control for which no vSRC was added to the labeling reaction. The other proteins (E-cadherin, pp120 and β-catenin) came from an immunoprecipitation of E-cadherin with anti-E-cadherin antibody. The pp120 and β-catenin proteins exist in a molecular complex with E-cadherin at the surface of the cell and they co-precipitate with E-cadherin. Some cSRC kinase probably also co-precipitated with the E-cadherin, accounting for the faint bands in lane 1. The vSRC kinase was immunoprecipitated from mouse NIH-3T3 cells that had been genetically engineered to express this chicken-derived oncogene. The E-cadherin was from mouse P19 embryonal carcinoma cells. (this picture was worth 290 words)

Uploaded for use on the Gel electrophoresis page.

Source: my personal image.

The copyright to this image is retained by John Schmidt (JWSchmidt).

Permission is granted to copy, distribute and/or modify this image under the terms of the Wikipedia GFDL, as indicated in the fine print at the bottom of this page.

JWSchmidt 位于英语维基百科，此作品的版權所有人，決定用以下授權條款發佈本作品：

	此檔案採用創用CC 姓名標示-相同方式分享 3.0 未在地化版本授權條款。 受免責聲明的約束。
	姓名標示: JWSchmidt 位于英语维基百科
	您可以自由： 分享 – 複製、發佈和傳播本作品 重新修改 – 創作演繹作品 惟需遵照下列條件： 姓名標示 – 您必須指名出正確的製作者，和提供授權條款的連結，以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動，但不得以任何方式表明授權條款是對您許可或是由您所使用。 相同方式分享 – 如果您利用本素材進行再混合、轉換或創作，您必須基於如同原先的相同或兼容的條款，來分布您的貢獻成品。
	已新增授權條款標題至此檔案，作為GFDL授權更新的一部份。http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

已授權您依據自由軟體基金會發行的無固定段落、封面文字和封底文字GNU自由文件授權條款1.2版或任意後續版本，對本檔進行複製、傳播和／或修改。該協議的副本列在GNU自由文件授權條款中。 受免責聲明的約束。http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

If you do not want to use this image under the terms of the GFDL, you can alternatively use it under the terms of the cc-by-nc-sa license.