TABLE 1.

Calculation of the size of the virus-fusing endosome

Fluorescent spot no.	Area (relative)	Diam
		Relative	Actual (nm)
1	1	1	125a
2	2.6	1.6	200
2-1b	1.6	1.3	160
3	50	7.1	890

^aThis value is given in Fig. 5B.

^b2-1 corresponds to the endosome immediately before fusion.