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Model for localization of forespore membrane proteins. (A) Any membrane protein (green) synthesized by a σF-dependent promoter inserts directly into the forespore septal domain. (B–D) Localized proteins (such as SpoIIQ) are retained through an interaction with a partner protein (blue) made in the mother cell or the septal peptidoglycan. (E) Nonlocalized proteins (such as MalF-GFP) freely diffuse throughout the forespore membrane.
