From that At Yale, Mellman set up a laboratory with cell biologist Ari Helenius, who had risen to fame for uncovering how viruses enter cells. Penetration of Influenza Virus Into Host Cells Robert W. Doms Toon Stegmann Ari Helenius https://link.springer.com/chapter/10.1007/978-1-4613-8890-6_13