背景资料: Elk-1 is a transcription factor that is activated by mitogen-activated protein kinases (MAPKs) and whose main function is the regulation of growth-related proteins in response to extracellular stimuli. Because of the importance of Elk-1 to the regulation of successful cell growth, accurate monitoring of Elk-1 in cells, tissues and animals is crucial for many biomedical research and drug development projects.