This video tells us about homocystinuria, etiology, treatment and symptoms related to it. Homocystinuria is an inherited disorder in which the body is unable to process certain building blocks of proteins (amino acids ) properly. There are multiple forms of homocystinuria, which are distinguished by their signs and symptoms and genetic cause. TIMELINE: 0:01 Introduction 0:14 Amino acids 0:36 Classification of amino acids 1:38 Causes 2:25 Symptoms 3:12 Diagnosis 3:53 Treatment