Figure 2.

Spore-surface display using spore coat proteins. The B. subtilis spore is composed of an internal core (yellow) surrounded by a peptidoglycan-like cortex (in red) and a proteinaceous coat sub-divided into an inner (gree) and an outer (black) part. The fusion protein, composed by a carrier (blue) and a passenger (purple) part is exposed on the spore surface.