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Major expression patterns of the upregulated genes in R. sphaeroides in response to blue light. (A) Cluster 3 represents genes whose expression was severalfold upregulated at 5 min of irradiation and remained upregulated at the attenuated levels upon prolonged irradiation. (B) Cluster 4 represents genes whose expression was upregulated ≤2.5-fold at 45 min of irradiation and did not change drastically at other time points.
