A. FRIL image of the IMP-clusters of AN-BC synapses. The thick line with a
double arrow indicates the maximum width of an IMP-cluster. B. Whisker-box
histogram showing the distribution of the IMP-cluster area for AN and PF synapses.
Horizontal bars show the median, boxes indicate the 25-75 percentiles, and whiskers
indicate the minimum and maximum. Crosses indicate the mean. C. Serial
ultrathin sections of an AN-BC synapse. Arrows indicate the edge of the PSD.
D. Cumulative frequency plots of the maximum widths of the PSDs and
IMP-clusters. The maximum widths of the PSD and IMP-clusters were not significantly
different (AN-BC: p = 0.70, AN-FC: p =
0.33, PF-FC p = 0.06, PF-CwC p = 0.30,
Mann–Whitney U test). Scale bar in A and
C: 200 nm.