HCV lacks 3′-5′ exonuclease activity, leading to variations in its envelope protein's antigenic structures, and host antibody production lags behind the generation of new mutant strains.
C型肝炎病毒缺乏3′至5′核酸外酶活性，這導致其包膜蛋白的抗原結構易變。宿主產生的抗體常常滯後於新變異株的產生。
| Front | Hepatitis viruses HCV lacks ____ ′ - ____ ′ ________ activity which leads to? How does the host respond to this? |
|---|---|
| Back | HCV lacks 3′-5′ exonuclease activity variation in antigenic structures of HCV envelope proteins Host antibody production lags behind production of new mutant strains of HCV. |
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