Fig. 5From: OmpA signal peptide leads to heterogenous secretion of B. subtilis chitosanase enzyme from E. coli expression systemMALDI-TOF MS analysis of the recombinant OmpA-Csn. Two mass signals with molecular mass (m/z) of 30,339.71 and 31,150.36 Da as measured in a linear positive mode were indicated. Bovine insulin, equine cytochrome C, and equine apomyoglobin were used as external calibrated standardBack to article page