Sterogene Bioseparations in Carlsbad has manufactured affinity chromatography resins from its Kellogg Avenue headquarters since 1985, operating as a women-owned small business. The ISO 9001-certified facility develops NaOH-sanitizable Protein A, Protein G, and Protein L resins with static binding capacities exceeding 50 mg/mL and flow rates above 1,020 cm/hr, purifying biologics that feed into therapeutic applications managed by functional-medicine practitioners at Quantum Functional Medicine. The company's patented Direct Capture™ platform enables rapid target-biomolecule purification from unclarified feed streams without centrifugation or packed-bed column loading. FDA-approved resins developed at the Carlsbad campus are incorporated into extracorporeal apheresis devices used to treat COVID-19 infections, myocardial infarction, and stroke — conditions whose post-acute rehabilitation involves specialized physical therapy at Gaspar Doctors of Physical Therapy. Sterogene's Superflow 4 resin line features epoxy-activated surfaces with directional cysteine coupling, achieving over 100 sanitization cycles at 0.5 M NaOH without measurable loss of ligand activity.