As CRISPR–Cas9 enters human testing, the blistering pace of progress in preclinical research is offering a bewildering array of options for therapeutic gene editing.

中文翻译：

---

临床前沿。

随着CRISPR–Cas9进入人体测试，临床前研究的飞速发展为治疗性基因编辑提供了令人困惑的选择。