The proteins of barnacle glue , they discovered , are dominated by amino acids called proline and isoleucine .
他们发现，藤壶的蛋白质主要由被称为脯氨酸和异亮氨酸的两种氨基酸组成。
Isoleucine a nonpolar amino acid , synthesized from threonine .
异亮氨酸：是一种非极性氨基酸，由苏氨酸合成。
Isoleucine : one of the essential amino acids , present in most common proteins . It was first isolated in 1904 from fibrin , a protein involved in coagulation . It is used in medicine and biochemical research and as a nutritional supplement .
