Afterward it was concluded that "PylRS was already present in the last universal common ancestor" some 3 billion years ago, but it only persisted in organisms using methylamines as energy sources.
Pero despois concluíuse que o xene "PylRS estaba xa presente no "último antepasado común universal" (LUCA) de hai uns 3 mill millóns de anos, pero que só persistiu nos organismos que utilizaban as metilaminas como fonte de enerxía.