Fig. 4.

Freeze-fracture images of cells expressing M1. (A and B) E-face (A) and P-face (B) images reveal abundant 4- to 6-nm pits or IMPs and occasional incipient square arrays with ≤12 pits or IMPs in square lattices with 6-nm spacing (ovals). (C) E-face image of an occasional cell with a larger number of incipient arrays (ovals) and singlet 4- to 6-nm pits (arrows). (Bars = 100 nm.)