PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 28498365-8 2017 Importantly, stable knockdown of Twist1 by shRNA markedly augments p21 expression, its nuclear accumulation, senescence-associated heterochromatin foci (SAHF) and amplifies the number of SA-beta-gal-positive cells. beta-D-galactose 190-198 twist basic helix-loop-helix transcription factor 1 Mus musculus 33-39