Table 2.

Propagon study of 21 cells from an unspecified [PSI⁺] colony

Cells	No. of propagons that are*			Average number of propagons
	Unspecified	Strong	Weak
1	10	0	0	Unspecified [PSI+]~26
2	14	0	0
3	21	0	0
4	19	0	0
5	33	0	0
6	22	0	0
7	13	0	0
8	11	0	0
9	17	0	0
10	51	0	0
11	68	0	0
12	0	156	0	Strong [PSI+] ~77
13	0	113	0
14	0	89	0
15	0	116	0
16	0	39	0
17	0	4	0
18	0	19	0
19	0	0	22	Weak [PSI+]~22
20	14	5	2	Mixture of all 3 ~14
21	5	1	2

^*The numbers of unspecified, strong and weak [PSI⁺] propagons present in each of 21 cells from an unspecified [PSI⁺] culture were determined as described previously (Cox et al., 2003).