Before revision: In rare cases, special amino acids such as selenocysteine , pyrrolysine or formylmethionine, can be incorporated by the translational apparatus in to proteins of some organisms.Wiltschi, B. and N. Budisa, "Natural history and experimental evolution of the genetic code".
After revision: In rare cases, special amino acids such as selenocysteine or pyrrolysine can be incorporated by the translational apparatus in to proteins of some organisms.Wiltschi, B. and N. Budisa, "Natural history and experimental evolution of the genetic code".