PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 28684116-8 2017 Furthermore, we report that a phosphoserine (pSer) in CD147 (pSer252) is responsible for this interaction and inhibition of the Smad4/p21WAF1 signal that promotes cell proliferation. Phosphoserine 30-43 basigin (Ok blood group) Homo sapiens 54-59