(A) Standard proteins analyzed by size-exclusion HPLC chromatography. Standard markers: bovine serum albumin (BSA, 67 kDa), ovalbumin (OVA, 44 kDa), insulin (Ins, 5.7 kDa) and tryptophan (Trp, 0.2 kDa); (B) AEL by size-exclusion HPLC; (C) Standard curve representing native molecular weight of AEL by size-exclusion HPLC; (D) SDS-PAGE, pH 8.3 purified AEL using 12% gel (running time 3 h at a constant 100 V). Mr, Molecular weight markers (from top to bottom): β-galactosidase (116.0 kDa); bovine serum albumin (66.2 kDa); ovalbumin (45.0 kDa); lactate dehydrogenase (35.0 kDa); REase Bsp981 (25.0 kDa); β-lactoglobulin (18.4 kDa); and lysozyme (14.4 kDa). The gels were stained with silver nitrate.