PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8206880-4 1994 Western blotting with anti-phosphotyrosine antibody showed that VIP stimulated tyrosine phosphorylation of two proteins of 42 and 44 kDa, which may be two isoforms of MAP kinase, erk1 and erk2. Tyrosine 34-42 mitogen activated protein kinase 1 Rattus norvegicus 188-192