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. 1998 Jun 1;18(11):3991–4000. doi: 10.1523/JNEUROSCI.18-11-03991.1998

Fig. 7.

Fig. 7.

Repeated applications of 5-HT to the terminal region failed to evoke a net change in SN varicosities.A, Epifluorescent view of a portion of SN neurites and varicosities contacting a motor axon (right toleft in the middle half of the micrograph) before stimulation (4× 5-HT to the terminal region). Three focal planes were superimposed to permit the visualization of all neurites and varicosities. A double arrow points to a neurite that retracts, because it is absent after 24 hr (seeB). B, Epifluorescent view of the same view area as in A 22 hr after the last 5-HT application. The arrow points to the branch that extended after treatment. The number of varicosities is unchanged after treatment. Scale bar, 5 μm.