... the ER extract of PSG cells of a normal-level fibroin-producing silkwormTable 2. Determination of molar ratios of H-chain, L-chain, and fhx/P25 in the fibroin secreted into cocoons of a normal breed ... glycoprotein [28,29], in uenzavirus hemagglutinin [30,31], and IgM [32] in ER, a furtherrole of N-linked oligosacharide chains of fhx/P25 in theprocess of assembly of the elementary unit in ER ... unit of fibroin [1], which consists of six sets of heavy chain (H-chain; 350-kDa fibrous protein)–light chain(L-chain; 26 kDa) disulfide-linked heterodimer and onemolecule of a glycoprotein, fibrohexamerin...