sentence: ( A ) Ten-fold dilutions of equal numbers of wild-type and GAL1 ,10 - expressing UBP1 , UBP2 , UBP3 , UBP4 , UBP5 , UBP6 , UBP7 , UBP8 , UBP9 , UBP10 , UBP11 , UBP12 , UBP13 , UBP14 , UBP15 , UBP16 and UBP17 cells were incubated at 25 ° C in the absence or in the chronic presence of MMS ( as indicated ) for 72 hours and photographed .