Identification and clonal characterisation of a progenitor cell sub-population in normal human articular cartilage. oleh Rebecca Williams, Ilyas M Khan, Kirsty Richardson, Larissa Nelson, Helen E McCarthy, Talal Analbelsi, Sim K Singhrao, Gary P Dowthwaite, Rhiannon E Jones, Duncan M Baird, Holly Lewis, Selwyn Roberts, Hannah M Shaw, Jayesh Dudhia, John Fairclough, Timothy Briggs, Charles W Archer