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Correspondence: D

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The correspondents are:
Dr J N Davidson, Dr Mansel Davies, Dr Bernard D Davis ("Threat and promise in genetic engineering"), Ronald E A Day, Egon T Degens, Max Delbrück (copy of letter to Kendrew), Dr Sergio DeCarvalho (paper on antigen-antibody recognition enclosed), Professor C E Dent (cannabis), Dr Elizabeth Deuchar (letter to Nature), Thomas S Desmond, Professor S Parvathi, Dr S Dhawan (Dr T M Jacob), Miss Renate Dietzel, M Dickens (The Butterfly Farm), Dr B P Doctor, Dr Roy H Doi (enclosing Doi, "Stable messenger RNA"), Dr Paul Doty, Dr John W Drake, Dr Shyam Dube, Professor N P Dubinin, Ronald Duncan, Dr Peter Dunnill (with enclosures), and Dr Dieter Dütting.

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