The key difference in this study was the presence of a single gene from the H3N2 human virus: the PB2 protein, which gave the hybrid viruses the ability to spread easily among the lab mice.
Perls says the key to successfully predicting long life was the sophisticated statistical analysis of many different gene variations that each played some role.
珀尔斯说，成功预测长寿与否的关键，在于精密地统计分析具有不同作用的基因种类。
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The key is a gene called Dio3, which governs the levels of thyroid hormone in the brain.