This video paves attention to cysteine as a non-essential amino acid, its synthesis and significance. Video covers the basic introduction, types of amino acids and types of protein structures in detail. TIMELINE: 0:01 Introduction 0:06 Formation of cysteine 0:37 Serine acetyltransferase enzyme 0:58 O-acetyl serine into cysteine 1:17 Enzyme involved 2:06 End