molecules Article Structural Features of Heparan Sulfate from Multiple Osteochondromas and Chondrosarcomas Noemi Veraldi 1, Alessandro Parra 2, Elena Urso 1, Cesare Cosentino 1, Manuela Locatelli 3 , Serena Corsini 3,* , Elena Pedrini 3, Annamaria Naggi 1 , Antonella Bisio 1,* and Luca ...