Occasionally, p75NTR-IR axon terminals contact PARV-labeled dendrites. A, In the infragranular hilus, a p75NTR-IR axon terminal (p75-T) forms a symmetric synapse (curved arrow) with a large PARV-IR dendrite (PARV-D). An unlabeled axon terminal (UT) forms a symmetric synapse (curved open arrow) with the same dendrite. B, In the infragranular hilus, a large p75NTR-IR axon terminal (p75-T) contacts (curved arrow) a small, PARV-IR dendrite (PARV-D).C, In the infragranular hilus, a large p75NTR-IR axon terminal (p75-T) forms a symmetric synapse (curved arrow) with a large PARV-IR dendrite (PARV-D). Scale bars: A, 0.65 μm;B, C, 0.5 μm.