src: It has leucine, isoleucine and valine that are present in the 2:1:1 ratio (for a part of isoleucine and valine, it contains twice as much leucine).
tgt: Possui leucina, isoleucina e valina presentes na proporção 2: 1: 1 (para cada parte de isoleucina e valina, contém o dobro de leucina).