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Abstract:
The growth pattern of the Escherichia coli envelope was studied by immunoelectron microscopy, using the outer membrane protein LamB specifically labelled by a double antibody gold particle technique. An operon fusion placing the lamB gene under lac promoter control permitted rapid turn-off of LamB synthesis. In the generation following turn-off no lamB-free regions appeared, strongly suggesting that bulk outer membrane material is not inserted in restricted growth zones.