| Based on the fact that directly sequenced peptides from subunit 7 are identical to more than 12 % of the hypothetical translation product of MSS 1 , and the fact that the molecular weight of subunit 7 ( 49 kDa ) corresponds to the predicted molecular weight of MSS 1 ( 48 , 633 Da ) , we conclude that subunit 7 is MSS1 . . ^^^ |