Differences in the JF and PJF arrays. (A and B) Original and highlighted versions of the junctional gap indicated by arrows in Fig. 1 C. The two continuous rows of JF are lined on either side by discontinuous rows of PJF, highlighted in yellow and in light purple, respectively in B. Note that feet contact each other within the rows, but PJF and JF are separated by a gap. Bar, 50 nm. Arrowheads identify JF, horizontal arrows identify PJF, and angled arrows delimit discontinuous rows of PJF. (C) A revised version of an illustration in Felder and Franzini-Armstrong (2002) showing a 3-D model of a triad with JF in blue and PJF in green.