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Plant‐based oral vaccines are a promising emergent technology that could help alleviate disease burden worldwide by providing a low‐cost, heat‐stable, oral alternative to parenterally administered commercial vaccines. Here, we describe high‐level accumulation of the hepatitis B surface antigen (HBsAg) at a mean concentration of 0.51%TSP in maize T1 seeds using an improved version of the globulin1...