Fig. 4.

Effects of Tsr overexpression on chemoreceptor array formation: immunogold labeling of Tsr on frozen thin sections of E. coli UU1250/pJC3 cells induced with 50 μM IPTG by using anti-Tsr antiserum, recognized by 10-nm gold-labeled protein A. Shown are representative cells from the same section demonstrating diffuse Tsr localization and Tsr receptor arrays (a) similar to those seen in wild-type cells (b) and radial (c) and axial (d) Tsr receptor assemblies, which represent nonfunctional receptor arrays.