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Regression patterns of differentially expressed genes identified from axolotls and tiger salamanders. LD = linear down, QLCD = quadratic linear concave down, QLVD = quadratic linear convex down, QV = quadratic convex, LU = linear up, QLVU = quadratic linear convex up, QLCU = quadratic linear concave up, and QC = quadratic concave.
