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(A) Infection of BALB/c 3T3 (a) and NIH 3T3 (b) cells with SH/mR2 did not lead to focus formation. (B) There was an increase in focus formation with B3/mR2 (b) and N3/mR2 (d) compared with B3/SH (a) and N3/SH (c) after transfection with the T24 H-ras plasmid. (C) The number of foci formed in three independent ras transfection experiments was plotted.
