I am making hypoxia situation in human pigment epithelial (RPE)using CoCl2.

I read the some paper that the cobalt could make hypoxia situation and reduce the cell viability. 

however i used from 50 to 500uM in the serum free medium  for 24h,

the viability is increased. The viability is measured by CCK-9

What do I wrong?

My RPE is passage #7 and cultured in DMEM with 10% FBS.

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