Stereo/regioselectivity of lipolytic enzymes. TAG is hydrolyzed to sn-1,3 DAG by ATGL or to sn-1,3 and sn-2,3 DAGs by ATGL co-activated by CGI-58. HSL preferentially hydrolyzes FAs at the sn-3 position of DAGs, yielding a mixture of MAGs (sn-2 and sn-1). MGL exhibits no selectivity in degradation of MAGs. G, glycerol.