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Direct test on agar plates of the reporter α-amylase expression ability of the desA promoter using round patches of growth of pUL99DA and pUL42DA transformants in LS medium containing 2,2'-dipyridyl as compared to transformants with pULVD10 in which the reporter amylase gene is under the control of the saf promoter. Control transformants with pUL99ADi and pUL42ADi are shown on the right. The plate was stained with I2 + IK; the figure is a negative of the plate photograph.
