Table 1.

Properties of types of terminals on larval Drosophila muscle based upon the following references: Anderson et al. (1988), Johansen et al. (1989), Budnik and Gorczyca (1992), Cantera and Nässel (1992), Jia and Budnik (1992), Atwood et al. (1993), Gorczyca et al. (1993), Jia et al. (1993), Zhong and Peña (1995) and Prokop et al. (1996).

Terminal type	Bouton size diameter	Vesicle type	Vesicle size	Transmitter
Type I	3–5 μm	Clear vesicles (CV)	40–50 nm; 44 ± 0.3 nm	Glutamate
Type I	3.1 ± 1.6 μm		30–50 nm
	max. 8 μm
Type Ib	2–5 μm	CV
Type Is	1–3 μm	CV
Type II	1–2 μm	Dense core vesicles (DCV)	100–150 nm	Octopamine
Type II	1.4 ± 0.6 μm
		Dark DCV	73 ± 2 nm
		Intermediate and light DCV	108 ± 6 nm; 97 ± 1 nm
		Small (translucent) CV	33.0 ± 0.5 nm;
Type III	1–3 μm			Proctolin
				Insulin-like-peptide
				PACAP
				Leucokinin I