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Fig. 5. Deletion of CRT1 or PBP1 suppresses the HU sensitivity of a ccr4
strain. (A) ccr4
crt1
(MT3771), ccr4
pbp1
(MT3777), wild-type (BY4741), ccr4
(MT3768), crt1
(MT3770) and pbp1
(MT3776) strains were tested for HU sensitivity by serial dilution analysis, as described in Fig. 2. (B) Indicated strains were assessed for irreversible HU sensitivity using a spiral plating system, as described in Fig. 2C. (C) Rad53 activity and phosphorylation were assessed in ccr4
dun1
(MT3772), ccr4
dun1
crt1
(RSYS07) and wild-type (BY4741) strains after exposure to 0.2 M HU for 3 hours, as described for Fig. 3.