Fig 2. Deletion of genes involved in S. suis serotype 2 capsular polysaccharide biosynthesis (cpsF and neuC) results in non-encapsulation of the ST25 strain 89–1591.

Transmission electron microscopy following labelling with polycationic ferritin of the ST25 wild-type strain 89–1591 (A) or its isogenic mutants 89–1591ΔcpsF (B) and 89–1591ΔneuC (C). Black bars = 1 μm.