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. 2018 Apr 3;9:545. doi: 10.3389/fmicb.2018.00545

Figure 11.

Figure 11

Transmission electron micrographs showing capsular polysaccharide (CPS) expression by GBS type III mutant carrying exogenous α-2,6-sialyltransferase. The CPS was labeled with polycationic ferritin. GBS type III wild-type strain was surrounded by a consistent CPS layer, whereas the GBSIIIsia2,6 (Δcps3K/cps2N) mutant showed intermediate state of encapsulation. The non-encapsulated strain GBSIIIΔcps is depicted as negative control. Bars = 1 μm.