They noted that genes were expressed within an environment, in particular that of prenatal development, and that genes were continuously controlled by the environment through mechanisms such as epigenetics.
Mereka mencatat bahwa gen-gen diekspresikan dalam suatu lingkungan, khususnya perkembangan pranatal, dan bahwa gen-gen terus menerus dikendalikan oleh lingkungan melalui mekanisme seperti epigenetika.