Simmie Foster and Andreas Mershin have asked to be added as personal signatories of the letter:

 Simmie L Foster , Massachusetts General Hospital, Boston Children’s Hospital  and Harvard, ...

Rudy Jaenisch has asked for his name to be added as a personal signatory of the letter:

Rudolf Jaenisch, Professor of Biology, Whitehead Institute and Dept. of Biology, MIT, Boston

Bob Gallo has asked to be added as a personal signatory of the letter:

Bob Gallo, Director, Institute of Human Virology, University of Maryland School of Medicine, Baltimore.