PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 10922466-3 2000 The proline-directed p42 mitogen-activated protein kinase (ERK2) was used to phosphorylate the serine side chain in Pro-Arg-Ser-Pro-Phe-4-nitroanilide under conditions where different amounts of cis prolyl isomer of the substrate were present. Proline 4-11 mitogen-activated protein kinase 1 Homo sapiens 59-63