Gatehouse 8 Pack 3 in Steel Window Security Pins in the Window Security Pins department at Lowes.com Colorado State University Pueblo CSU Pueblo Amino acids are molecules used by all living things to make proteins. Your body needs 20 different amino acids to function correctly. Nine of these amino acids are called essential amino acids. N ((morpholin 2 yl)methyl) ethanamine AldrichCPR Sigma Aldrich