Acetyl group known as paracetamol), and acetylsalicylic acid (better known as aspirin). The introduction of an acetyl group into a molecule is called acetylation. In biological organisms, acetyl groups are commonly transferred from acetyl-CoA to other organic molecules. Acetyl-CoA is an intermediate both in the biological synthesis and in the breakdown of many organic molecules. Acetyl-CoA is also created during the second stage of cellular respiration, the Krebs Cycle, by the action of pyruvate dehydrogenase on pyruvic acid. Histones and other proteins are often modified by acetylation. For example, on the DNA level, histone acetylation by acetyltransferases (HATs) causes an expansion of
Willow Rosenberg Willow is capable of. When Willow eventually exhibits what power she has, it briefly frightens Kennedy. Willow worries about becoming sexually intimate with Kennedy, unsure of what may transpire if she loses control of herself. In season 7 episode 20, "Touched", in which practically all the main cast has sex (two by two) Willow and Kennedy take part in the first lesbian sex scene on primetime television. In "Season Eight", Kennedy and Willow are still romantically involved, but separated during Willow's self-exploration. Unlike her relationship with Tara, Willow is able to hold a separate identity while with Kennedy. When she