pVHL and SMAD occur complementary (IMAGE) Goethe University Frankfurt Caption Stained liver tissue shows the complementary occurrence of pVHL and SMAD proteins: Where pVHL (green) is abundant, SMAD2/3 (red) is scarce, and vice versa. Cell nuclei are stained blue. The lower right picture shows all three colours combined. Photos: Xinglai Cheng/Goethe University Credit Xinglai Cheng/Goethe University Usage Restrictions To be used only when reporting on Goethe University Frankfurt and giving credit details License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.