TABLE 1.

Capsid stability at 0°C^a

Virus	No. of capsids after incubation at temp (°C):
	39	31	0
wt	32.0		34.2
ts1203	28.5		34.9
ts1201	50.2		0.7
ts1201	50.2	21.2	11.9

^aValues represent the numbers of capsids seen in 25 nuclear sections from the samples shown in Fig. 2. For wt, ts1203, and ts1201, the numbers given are values after incubation at 39°C for 10 h and after a further 4-h incubation at 0°C in the presence of cycloheximide. In addition, the numbers present for ts1201 after downshift to 31°C for 4 h and subsequently to 0°C for a further 10 h (see Fig. 2) are shown. The same 39°C starting value for ts1201 is given twice for clarity.