Fig. 7.

Nerve terminals are stably maintained in GGF2-treated adult muscles. Junctions are labeled as in Figure 2.A–C, A junction from a control P35 soleus muscle. Three terminal SCs (A) are present covering the nerve terminal branches (B) at this synapse. AChRs (C) are completely covered by the overlying nerve terminal. D, E, Two junctions from a P35 soleus muscle treated with GGF2 for 5 d beginning on P30. The terminal SCs (D) at both of these junctions had extended processes (arrows), although nerve terminal sprouts (E) were seen only at the lower junction (arrows in E). Nerve terminal branches cover the underlying AChRs (F) in their entirety. Scale bar, 30 μm.