TABLE 1.

Frequency of mutation of microsatellite reporter

Expt no.	No. of plates	No. of viable cells/plate	No. of PSa colonies per plate	Mean no. of PS colonies per plate	Median no. of PS colonies per plate	SD for no. of colonies per plate	Mutation frequency (per 107 viable cells)
1	15	4.6 × 107	381-843	675	749	151	147
2	11	7 × 107	958-1,215	1,057	1,050	76	151

^aPS, photosynthetic.