pplpod Episode 127 dives into the work of K. Christopher Garcia—the Stanford/HHMI structural biologist whose pictures of proteins changed how we think about immunity and therapy. We trace his path from biochemistry to crystal/cold-room obsession, then into the landmark structures that mapped how T-cell receptors read peptide–MHC “name tags” and kick off an immune response. From there: cytokine and receptor engineering—rationally tuning IL-2–style signals, biasing pathways, and building designer ligands that aim immune power where it’s needed and spare what it shouldn’t scorch. We unpack the tool kit (X-ray crystallography to cryo-EM, surface engineering, affinity/kinetic dial-turning), the spinouts that move ideas to clinic, and the broader arc: when you can see signaling at atomic resolution, you can start to edit it. Curiosity, rigor, translati ...