antipain was ineffective in influencing mnng-induced sister chromatid exchanges , but it increased frequencies of chromosomal aberration ( per metaphase ) at 10 , 26 , and 40 hr when cells were treated with mnng at 0.25 microgram/ml of medium followed by antipain 10 min later , the procedure used in the transformation studies .
C0025564
metaphase
C0007634
cells