Measurements of CFTR-mediated Cl- secretion in human rectal biopsies constitute a robust biomarker for Cystic Fibrosis diagnosis and prognosis. oleh Marisa Sousa, Maria F Servidoni, Adriana M Vinagre, Anabela S Ramalho, Luciana C Bonadia, Verónica Felício, Maria A Ribeiro, Inna Uliyakina, Fernando A Marson, Arthur Kmit, Silvia R Cardoso, José D Ribeiro, Carmen S Bertuzzo, Lisete Sousa, Karl Kunzelmann, Antônio F Ribeiro, Margarida D Amaral