Figure 2. Partial ¹H-¹H TOCSY NMR spectrum of a human salivary supernatant specimen. A typical spectrum is shown. KEY: 1, saturated fatty acid (terminal end spin system); 2, leucine; 3, saturated fatty acid (intermediate carbon spin system); 4, lysine; 5, unassigned; 6, -aminobutyric acid; 7, ornithine; 8, unassigned; 9, isoleucine; 10, propionate; 11, valine; 12, glutamate; 13, glutamine; 14, proline; 15, unassigned; 16, propane-1,2-diol; 17, unassigned; 18, threonine; 19, unassigned; 20, phosphorylethanolamine; 21, tyrosine; 22, phenylalanine; 23, aspartic acid; 24, alanine; 25, ethanol; 26, lactate; and 27, 28, 29, and 30, unassigned.