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Therapeutic proteins such as enzymes, hormones, and cytokines suffer from poor stability, inefficient cellular penetration, and rapid clearance from circulation. Conjugation with polymers (such as poly(ethylene glycol)) and fusion with long-acting proteins (such as albumin and Fc fragments) have been utilized to partially address the delivery issues, but these strategies require the introduction of new macromolecular substances, resulting in potential immunogenicity and toxicity. Herein, we report an easy strategy to increase the intracell