Recently, Jeff Grant of Hastings, New Zealand supplied the editor with the full 3641-letter name of the protein Bovine Glutamate Dehydrogenase, as constructed from the amino acid residue sequence shown in The Atlas of Protein Sequence and Structure (1973), Volume 5, Supplement 1, published by The National Biomedical Research Foundation. Although this word has been cited by the Guinness Book of Records since 1976 as the longest word known, it was never written out in full there, nor has it apparently been published anywhere else.
Eckler, A. Ross
Word Ways: Vol. 13
, Article 14.
Available at: http://digitalcommons.butler.edu/wordways/vol13/iss2/14