A non-conserved amino acid variant regulates differential signalling between human and mouse CD28 oleh Nicla Porciello, Paola Grazioli, Antonio F. Campese, Martina Kunkl, Silvana Caristi, Marta Mastrogiovanni, Michela Muscolini, Francesca Spadaro, Cédric Favre, Jacques A. Nunès, Aldo Borroto, Balbino Alarcon, Isabella Screpanti, Loretta Tuosto