[R] retrieve p-value from a cox.obj

[clearsky]

I have a cox.obj named obj, 
obj <- coxph( Surv(time, status) ~ group, surv.data)
now I want to retrieve the p-value from obj, so that I can run this hundreds
of times and plot out the distribution of the p-value. could anyone tell me
how to get p-value from obj?

thanks,

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