The act of taking an enzyme from nature and playing with those amino acids, tinkering with those letters, putting some letters in, taking some letters out, maybe rearranging them a little bit, is a little bit like finding a book and editing a few chapters or changing the ending.
Tomar enzimas de la naturaleza y experimentar con esos aminoácidos, acomodando esas letras, agregando algunas, quitando otras, quizá reorganizándolas un poco, es similar a tomar un libro y editar unos cuantos capítulos o cambiar el final.