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(A) The cells treated with different treatments were cultured in a 37° C cell incubator for 12 days in a low melting point agar with an upper layer of 0.33% in 8,000 wells per well. The resulting clones were stained with crystal violet. (B) The clones formed were observed and counted (under eye view and microscope of 40 magnifications). **P < 0.01.
