畸形小头

Most clinicians define microcephaly as being less than 3 standard deiations below the mean of expected head circumference.

大多数临床医生将头小畸形定义为小于预期头围均值的3个标准差。

This year, several groups published evidence that natural selection has recently favored a handful of uniquely human genes expressed in the brain, including those for endorphins and a sialic acid receptor, and genes involved in microcephaly.

今年（2005年），一些研究小组找到了证据证明自然选择在近期赋予了人类一些在大脑表达的、独有的基因，包括表达内啡肽和一种唾液酸受体的基因，以及与头小畸形相关的基因。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。