PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2432431-9 1986 After activation of normal T cells by antigen or lectin, p21 is phosphorylated on tyrosine residues and gp21 is phosphorylated on serine residues. Tyrosine 82-90 cyclin-dependent kinase inhibitor 1A (P21) Mus musculus 57-60