Figure 4From: Properties of cellular and serum forms of thymidine kinase 1 (TK1) in dogs with acute lymphocytic leukemia (ALL) and canine mammary tumors (CMTs): implications for TK1 as a proliferation biomarkerReceiver operating characteristic (ROC) curve for the serum thymidine kinase 1 (sTK1) in healthy and canine mammary sera. (A) sTK1 activity. (B) sTK1 protein assay results.Back to article page