Fig 1: BMP9 is expressed in human RCCRepresentative images of FFPE samples immunostained with anti-BMP9 antibody are shown. A. Positive and B. Negative CHO cell line controls were used for antibody optimization. C. Positive primary clear cell RCC. Note the presence of positive tumor cells both in Fuhrman nuclear grade 2 area (arrow) and in Fuhrman nuclear grade 2 area, D. Negative primary ccRCC, E. Positive primary ccRCC and F. Corresponding positive lung metastasis.