I have a question: Does the sensorgram of the negative response look like the attached figure? I use a CM5 chip immobilised with His to capture my protein and then use other proteins as my ligand. The assay is to calculate EC50 and relative potency. My ligands are heat-treated. I would to check if it is normal to not see the capture curve on the sensorgram of treated samples. I have used a control (non-treated samples) and the curves look pretty (positive RU). My samples are at nanomolar concentration (serial dilution) and I use HBS-EP+ buffer.