Phosphorylated Extracellular Signal-regulated Protein Kinases 1 and 2 Phosphorylate Sp1 on Serine 59 and Regulate Cellular Senescence via Transcription of p21Sdi1/Cip1/Waf1

H. S Kim and I. K. Lim

The Journal of Biological Chemistry 284 ( 23 ): 15475 - 15486 , 2009