Lipoprotein lipase is an enzyme found in the capillaries that catalyzes the hydrolysis of triacylglycerols in chylomicrons to glycerol and fatty acids (Figure 18.6, Figure 18.7). Lipoprotein lipase is activated by apoprotein C-II, which is found in all of the lipoprotein complexes except LDLs. Apoprotein C-1 may also be involved in activation of lipoprotein lipase.