passages.id: split_8_test_1137_passage
passages.type: progene_text
passages.text: Upon stimulation with the agonist peptide CAP1 - 6D , several different CEA - specific CTL lines exhibited a marked shift in the peptide dose response , which resulted in as much as a 1,000 - fold increase in the levels of GM-CSF and gamma-IFN produced as compared with the use of the CAP1 peptide .