Document 0161 DOCN M9440161 TI When to speak [letter] DT 9404 AU Perutz MF SO Nature. 1994 Feb 10;367(6463):504. Unique Identifier : AIDSLINE MED/94150640 DE *Acquired Immunodeficiency Syndrome/HISTORY France History of Medicine, 20th Cent. Human HISTORICAL ARTICLE HISTORICAL BIOGRAPHY LETTER JOURNAL ARTICLE SOURCE: National Library of Medicine. NOTICE: This material may be protected by Copyright Law (Title 17, U.S.Code).