Mrs Claudia Steinman receiving the Nobel Medal and Diploma on behalf of the late Professor Ralph M. Steinman from His Majesty King Carl XVI Gustaf of Sweden at the Stockholm Concert Hall, 10 December 2011. Copyright © The Nobel Foundation 2011
Photo: Frida Westholm

Mrs Claudia Steinman blew a kiss after receiving the Nobel Medal and Diploma on behalf of the late Professor Ralph M. Steinman at the Stockholm Concert Hall, 10 December 2011. Copyright © The Nobel Foundation 2011
Photo: Frida Westholm

Family and friends of he late Professor Ralph M. Steinman assembled after the Nobel Prize Award Ceremony at the Stockholm Concert Hall, 10 December 2011. Copyright © The Nobel Foundation 2011
Photo: Lina Göransson

Mrs Claudia Steinman, wife of the late Medicine Laureate Ralph M. Steinman, arrives at the Nobel Banquet accompanied by Chemistry Laureate Dan Shechtman. Copyright © The Nobel Foundation 2011
Photo: Orasisfoto

Mrs Claudia Steinman, wife of the late Medicine Laureate Ralph M. Steinman, and Chemistry Laureate Dan Shechtman at the Nobel Banquet, 10 December 2011. Copyright © The Nobel Foundation 2011
Photo: Orasisfoto

Michel C. Nussenzweig delivering a Nobel Lecture on behalf of the late Ralph M. Steinman in the Jacob Berzelius Lecture Hall at Karolinska Institutet, 7 December 2011. Copyright © The Nobel Foundation 2011
Photo: Orasisfoto

Mrs Claudia Steinman (left), wife of the late Professor Ralph M. Steinman, with daughter Lesley (right) and grandson Robert at the Nobel Museum in Stockholm, 6 December 2011. Copyright © The Nobel Foundation 2011
Photo: Orasisfoto

Portrait of Professor Ralph M. Steinman.

Photo: Zach Veilleux/Rockefeller University

Professor Ralph M. Steinman, 2011 Nobel Laureate in Physiology or Medicine, in his laboratory.

Photo: Zach Veilleux/Rockefeller University

Professor Ralph M. Steinman in his laboratory.

Photo: Courtesy Rockefeller University

High-resolution image of a dendritic cell made by Ralph M. Steinman in 1973.

Photo: Ralph M. Steinman

Ralph M. Steinman's wife, Claudia Steinman, speaks with reporters after the announcement of the 2011 Nobel Prize in Physiology or Medicine.

Photo: Zach Veilleux/Rockefeller University

Ralph M. Steinman's daughter, Alexis Steinman, speaks with reporters after the announcement of the 2011 Nobel Prize in Physiology or Medicine.

Photo: Zach Veilleux/Rockefeller University

Michel Nussenzweig, Ralph M. Steinman's first student and longtime collaborator, addresses reporters at the press conference after the announcement of the 2011 Nobel Prize in Physiology or Medicine.

Photo: Zach Veilleux/Rockefeller University