KnowraThreonineLinked fromLinked fromThe 4 pages that link to Threonine, each with the reason it gives.All 4Related 2Compared with 2SerineCompared with: Like serine, it has a hydroxyl side chain, but humans must obtain it from food.IsoleucineCompared with: Threonine shares isoleucine's molecular formula but differs in side-chain structure and polarity.