But it turns out the environment is very critical for this, and you can only define an essential or non-essentialgene based on exactly what's in the environment.
但是，环境对此的影响非常关键，我们只能根据环境中确实存在的条件来定义必需或非必需的基因。
2
One gene that changed in offspring, for example — known as Ppara — is essential in cholesterol management and the liver's role in converting lipids.