amino isocaleric acid 基本例句 缬氨酸 Valine is one of the essential amino acids.缬氨酸是一种氨基酸。 Alien microbes could incorporate unusual amino acids such as isovaline and pseudoleucine, which have been found in meteorites.外在的微生物能够合成不寻常的氨基酸,比如异缬氨酸和叔亮氨酸这些只有在陨石中出现的氨基酸。