3.4.21.84 ? upon activation cleavage of the light chain occurs resulting in the accumulation of two new fragments of MW 34000 and 8500 on reduced SDS-PAGE 29791 3.4.21.84 ? x * 123000, Limulus polyphemus, SDS-PAGE under nonreducing conditions 29790 3.4.21.84 ? x * 80000 + x * 43000, Limulus polyphemus, SDS-PAGE after reduction with 2-mercaptoethanol 29790, 29791