FRANCE - APRIL 28: Cured Wilco gives a kiss through the plastic sheet of the sterile 'bubble' to Yacine, another child affected with severe combined immunodeficiency (SCID) X1 who got a classical bone marrow transplant at Necker Hospital for Sick Children, in Paris, France on April 28, 2002, where Wilco got his first gene therapy in October 1999 - On the left is Roelien Conradi, Wilco's mother. (Photo by Raphael GAILLARDE/Gamma-Rapho via Getty Images)
