Fig. 2. Cell morphology of Streptococcus suis type 2 wild-type (WT) and its isogenic Δstp1 mutant. Transmission electron micrographs of bacteria (A–C). Scale bars = 5 µm (A), 0.2 µm, 100 nm, 50 nm (B, from left to right), 0.2 µm, 100 nm, 100 nm (C, from left to right).