Prof. Dr. Ralf Küppers is the director of Institute of Cell Biology (Tumor Research), University of Duisburg-Essen, Germany. The work of Prof. Küppers revolves around B cell differentiation and function together with pathogenesis of human B cell lymphomas - both Hodgkin and Non-Hodgkin lymphoma. We discuss how micro-dissection and Sanger sequencing is still the method of choice when analysing Hodgkin lymphoma and the V-gene usage and mutations in CLL as prognostic indicators before talking about tracking pathogenic clones when surveying for relapse during clinical follow up.  The episode is hosted by Dr. Ulrik Stervbo and Dr. Zhaoqing Ding. Comments are welcome to the inbox of [email protected] or on social media under the tag #onAIRR. Further information can be found here: https://www.antibodysociety.org/the-airr-community/airr-c-podcast.