PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 31667337-5 2019 We established that the proline at 841 of ROR1 was required for it to recruit cortactin and ARHGEF1, activate RhoA, and enhance breast-cancer-cell migration in vitro or development of metastases in vivo. isoleucyl-prolyl-proline 24-31 Rho guanine nucleotide exchange factor (GEF) 1 Mus musculus 92-99