Fig. 6From: Cytoplasmic glycoengineering of Apx toxin fragments in the development of Actinobacillus pleuropneumoniae glycoconjugate vaccinesIn-tact MALDI-MS analysis of purified ApxIA (a and c) and ApxIIA (b and d) expressed from wild type E. coli (upper panels) and with ngt and agt encoded on the chromosome (lower panels). a and b are peaks corresponding to singly charged ions, c and d are peaks corresponding to doubly charged ions. The mass shift in the peaks observed in the lower panel in each figure correspond to the addition of hexose unitsBack to article page