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Leu+ revertants accumulating in the micro-drops as a function of time. A: On CM plate(day 12), without papillae can be seen on the thicker mosses. B: On MM+P plate(day 5), papillae can be seen on the thin mosses. 1.87 × 107 cells per drop. C: On MM+P plate(day 5), papillae can be seen on the thin mosses. 2.96 × 108 cells per drop. D: On MM+P plate(day 12), papillae can be seen on the thin mosses. 2.96 × 108 cells per drop.
