Table 1.

Morphology of photoreceptor synapses in wild-type and laminin β2 chain-deficient retinas

Wild-type (n = 95)β2 Chain-deficient (n = 219)
n%n%
Triads5052.63167.31
Dyads4042.1110748.86
Floating ribbons44.218438.36
2 on 11-a11.05125.48
  • Synapses from wild-type and laminin β2 chain-deficient retinas were observed in transmission electron micrographs and placed into one of four categories. Most wild-type synapses consisted of the typical triad arrangement (see Fig. 7A), whereas most laminin β2 chain-deficient synapses were abnormal.

  • F1-a Two ribbons apposed to a single postsynaptic element.