PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 24788960-7 2015 With SA-beta-Gal staining, we show that Klf4(-/-) MEFs enter senescence earlier than Klf4(+/+) MEFs, and western blot shows accumulation of p21 and p53 with increasing passages. beta-D-galactose 8-16 Kruppel-like factor 4 (gut) Mus musculus 40-44