Absolute transcript expression signatures of Cyp and Gst genes in Mus spretus to detect environmental contamination JULIA RUIZ-LAGUNA, †, § NIEVES ABRIL, †, § TAMARA GARCÍA-BARRERA, JOSE-LUIS GÓMEZ- ARIZA, JUAN LÓPEZ-BAREA, AND CARMEN PUEYO *, SUPPORTING INFORMATION: Figure (p. S1), Table (p. S2), literature cited in Table (p. S3)